I think the whole thing is just because lack of marketing and advertising. And about Amiga's beginning to become dated in the early 90's, compared to other hardware. Even if they DID make computers wich were a match for PC's of that time, or even the SNES, they wouldn't have come far by lack of marketing...
And I know, Commodore tried to make more sales out of ancient technology (C= 64 and A500), because people were still bying them, and developers still programmed for them, which is good in one way, but sometimes improvement isn't real bad at all. AGA was a good thing, so the A1200 finally could beat a Megadrive, graphics-wise, and could get close to a SNES. But it was 1 or 2 years too late, and the support for it from developers could have been so much better. How many true AGA-games were made, starting with the release of the A1200? And why the hell did it still have the same old sound-chip of the A1000?
It's all about marketing, look at the Sega Dreamcast: An excellent machine, with the potention of being a real multimedia-livingroom computer. Even superior than the Playstation 2 in some points, which came out a little later. But due to lack of support from the "big boys", who were focussed on the PS2 (because Sony did handle aggressive marketing-tactics, like saying the PS2 could handle 60 million polygons per second, even though it only has 4MB of video memory), it also eventually "lost"
