There is no way to destroy Molly Carpenter, nothing that could rid her of her humanity in short order.  Mab still has traces a thousand years after the fact. So unless it can be parsed differently it means kill the Winter Lady. And considering that Mab is planning for her death in battle this is a fraught statement. She effectively says that it may be better to  be without a Queen and a Lady.

If you're a Star Trek fanatic you can see some similarities between the episode "Where No Man Has Gone Before" and this.

Outside of the glowing eyes?  I really don't, crossing the galactic boundary, both Harry and Molly made that choice, Harry more overtly, Molly, less so, but she continued to train under "Auntie Lea."
Acquire godlike powers, some would say as wizards both had them before the mantles, so far neither is corrupted by them, it is a struggle though and been close.  One wants to stop the other because one believes that he or she is a god? Not yet... Struggle with their mantles is the closest to that show.. Oh and did you hear Captain Kirk at age 90 is in space!!! 

Now there's a word picture that I can go to bed on.  Rudolph craps Brimstone. Who knew?

He does appear to be possessed doesn't he?   Also crapping when you think you are about to be killed in an unpleasant way is a natural biological function....  It doesn't exactly give him the odor of sanctity when you think about it, so crapping brimstone fits....

I thought as much. But why would being burned by the sword produce the smell of sulphur?

Warning...

I am suspicious about that loosing your soul thing, it might be a very human-centric way of interpreting what is happening. Molly feels the importance of what she is doing, it is not a so called "bullshit" job. She might get a ot of satisfaction out of it.

But at some point she had to decide if immortality is worth giving up her immortal soul... I think at some point Mab had to make that choice and doesn't think Molly is up to that yet.

After the movie is over, the trainers, chefs and drug dealers have all left (or alternatively the Fallen Angel). I can't keep up that level of fitness anymore.  But, I've learned a ton and with some effort I can keep it up at least to a degree.  Maybe I can't be as fit as I was with those true professionals guiding me each step of the way, but I'm a great deal more fit than I was before they came and left.

It doesn't work that way, I think the text is pretty clear on that.  Say you are thirty when you take up the coin, you physically stay thirty as long as you host the coin.  Give up the coin say when you are ninety, your body reverts to a ninety year old body.  It doesn't happen all at once, as in instantly but over several months your body will eventually become what ever age it is supposed to be.  That is what was happening to Cassius, no amount of exercise and diet is going to stop it.  Perhaps for a while, but a ninety year old body has it's limitations.

"Mollys story is not a happy one" imagine if he said the opposite, what could do more to take out tension from the story than reassurance that Molly's story will have a happy ending.

Ok lots of things could, but you get the point.

It has never been a happy one, Molly has a purpose now, but is she happy with her job?

It meant to hurt him enough to bring him to his senses rather than permanently damage him, though. That's what I mean by shock.

Exactly, and from Harry's reaction and continued shame because of that burn, it straightened him out totally. 

My point is that the Alphas are proof that you don't need a coin.  I think that Alphas could turn into giant demon bears or grape apes -- just like Listens to Wind -- if they worked on it.  The Alphas are working on other stuff, just not grape apes, according to them.  Frankly, why would they?  wolves are almost ideal predators if you have a pack.  Grey proved to me that giant demon bears are not that practical.

Yes, but not everyone can become an Alpha, there is some other stuff going on as well.  If you don't have that pre-existing talent, without a coin, I don't think it is going to happen.  I think the bigger question is why do you think you need to turn into anything with the power and strength that comes with it?  That is the temptation, Nic is very careful to match potential hosts with their coins, he had good reasons to match Lasciel with Harry.

Harry could learn to speak all sorts of languages too -- if he worked on it -- I can't be bothered to learn Spanish, not because of an lack of use for it, but because I'm too lazy.  But, I'd take a Matrix download of Spanish in a heartbeat.

Yes, if he worked at it, but then again how many people teach conversational Etruscan these days?  Yes, with Lasciel's help Harry could and was able to understand the Ghouls.

In short, the temptation of the Coin is NOT the skills or the power per se, it's that they get to skip the hardship of EARNING those skills.  Hellfire might be the one exception.  You might not be able to channel Hellfire without that demonic bargain, whether express or implicit. 

No, reread the conversations between Lasciel and Harry, even after he mastered Hell Fire etc., she was tempting him with more power.. It isn't about earning those skills, Harry already had a pretty good fire spell, he had learned and earned it, Hell Fire really wasn't a short cut for him at all.

In short, Marcone could become a Senior Council level wizard -- but he doesn't have the six hundred years of life and hard work it would take.  A Coin is a great short cut, so he gives into the temptation.  His further temptation is that if he could do X in a decade, what could he do with infinity?  I'm sure Namshiel TELLS him that if he ever gave the coin up, he couldn't do X anymore.  If Marcone believes him, then he won't be able to do X.  But, personally, I think it's a lie.  Once you learn to tie your shoes, magically speaking, you can. 

No, you pretty much lose whatever skill you got with the bargain.  Look as Cassius, first things first, when he gave up his coin, he started to age rather rapidly to whatever his real age was.