Is the point of limiting magic to wizards just going to push casters to choose sorcerers and warlocks, or hybrids to have something to back up the limited magic- like a Trickster or Eknight? Does this now need to limit those classes or get rid of some of them outright? What about diving magic? The ripples in the lake keep getting larger.
I'm getting a feel of the Darth Vader evil empire and putting their thumb down on certain magic unless you are in the know. This could be a cool idea to play on the fringes like the new republic and have underground locations and secret allies willing to help with some rare spells of their own.