Yes,licensing the client other than MIT License will limit the adoption and development. satoshi has once spoken about the Licensing of the client and why he doesn't want to go with GPL or other licenses.
Hey, In the
BTC ecosystem there is private soft, but these developments in a standard situation can be compatible with the GPL license. The main problem is that the restrictions that may impede alternative development cannot be called licensing, since this is the way to the absence of an independent library.