It would be financially suicide to build a variety of systems for a variety of price ranges in a small market.
Besides, IMHO ppc makes sense, there is no need for amiga os to become yet another obscure x86 OS. And stepping in others footstep, means you can never pass them.
And given the budget AmigaOS has you aren't going to pass anyone, Andriod, iOS, MS Windows, OSX... Realistically it's survival you want, anything else is cream.