I really don't get this race idea. there is no race, there is no competition, that took place a decade and a half ago and Amiga lost. Amiga now is in a place of being something that you use in addition to a PC or Mac, it's not and never will be a replacement.
Now since this isn't a race it makes sense to have the Amiga run on the same hardware as Macs and PCs. Especially in this day of virtualisation. You can have a PC with a virtual Amiga, an Amiga with a virtual PC or Mac. The hardware should be the same to make this easier.
This whole idea that I even need a computer for each OS is just plain silly. Why? Because that's how they did things back in the 20th Century?
I have a Mac, I run OS X, XP, Gentoo Linux, one box, one screen, on keyboard. Intel/AMD equipment is cheap, can you say that about Amiga equipment? Stuff that you would throw out if it we're Amiga, and you pay 100s of dollarsfor it, where's the sense?