When I want a new Amiga system, I dont care what CPU it has, I want it CHEAP and FAST!
Amiga was never about having the fastest CPU. Amiga was a media PC and it had the advantage because of its custom chipset. The Blitter was a proto-GPU. Xbox 360 gets by on a 3-core PPC chip (I wonder if AROS could be made to run on it?) and is perfectly affordable.
Performance-wise I'd like an Amiga that could play media and browse the internet without sweating, maybe play some games, maybe a bit of graphic design and compose some music... it was a computer you could use to do anything, let your creativity out. It was never a workhorse. I still occasionally use my A1200 for these sorts of things even today.
If you want a blazing fast CPU, get a PC, they've already got that market covered. Amiga needs to fill a niche to succeed. The niche exists. There were people installing Linux on Playstation 3 until Sony stopped them, for some reason.
The niche is not tablets, either. The Amiga niche is a computer that goes under your TV and doesn't need to boot the full OS to play a DVD.
At least, that's the way I see it.