Just wanted to chime in - as with all codification of rules, I think that this is awesome and pretty damn convenient, but rather susceptible to munchkinism. If possible I'd suggest adding limits on how far you can expand it by taking Powers - RAW, a Submerged character could use Incite Effect on an entire city. While it should be possible, for things like the Darkhallow, doing it as a starting character seems off. I'd like to suggest a maximum cap equal to your skill cap - it allows for legendary god-like beings and archmages like Cowl and Kemmler without breaking the setting, and it gives the GM more precise control over how high-powered the game is going to be.
Also, I understand that spellcasting is powerful, but doubling the cost for the power still seems off to me, especially when the new rules already allow casters to spend complexity (which RAW is practically free, unless you use my houserules) to expand the area of effect.
Also, I like that stuff like the ritual bloodline curse can now be statted out without GM fiat. Have you tried statting up the Darkhallow?