Good points. I'm also thinking about how i could use the ritual in normal play.
If you wanna kill someone, but have moral qualms, then you can send them 500 years into the future. They're not dead or even hurt, but they're not your problem any more.
Avoids First Law issues too. That often doesn't mean much in person where you can incapacitate and then shoot, but it's pretty important if you're attacking through an arcane link.
Also convenient if your enemy is immortal, like a Denarian in a coin. Such enemies are likely to have defenses, though.
Could be a fancy way to preserve someone who's dying. Send them forward a week, get a team of doctors ready to receive them when they return.
You could use it for an ambush too. Go to where someone will be, send soldiers forward to when they'll be there. You could try it with a bomb too, but hexing might interfere.
If you can cast fast, it might be a good way to avoid attacks. Step forward five minutes, one minute before the bomb drops.
PS: I'll get rid of the duplicate thread.