@iggy
A 68k based "AT" might have had some impact in specialized fields, but overally it would've been a complete failure (not compatible with any SW, slower than a 80286 without offering any real benefits).
Sure in the end the intregrated GFX and sound helped the demise of the Amiga but in 1985-90 it was exactly what set it apart from the competion.
Comparing the X1000 to the Peg2 on bare specs is more than a bit unfair when you ignore the fact that there are 6 years (and counting) between the release-dates. Back than a G4 at 1GHz was closer to mainstream specs than that P6T is today. Add the pricing to the equation and it should become crystal clear that the Peg2 was a much more sensible offer back than the the X1000 will be in 2011(?).
Dual-Core under OS4 is just as interesting as dual-core on my ARESOne under AROS (read it's pointless) except that the later will eat the former for lunch if we get down to raw performance.
The number of P6Ts might be limited but so is the number of people prepared to spend 2000Euro (or more) for an obscure piece of HW based on a CPU moothballed 5 years ago.