There's a fair risk of this turning into new monopolies, but at least it should take a while and hopefully other companies will figure out how to meaningfully compete
I guess the fact that Apple will probably never sell this stuff for non-Apple computers will allow AMD to keep competing on the PC side.
Clearly when Apple come out with a desktop class chip though, it's going to be hard for anyone else to come close.
Somehow that doesn't seem to be a problem for Android though!