Doom didn't kill the Amiga, Wolfenstein did... Released in '92, it showed where computer graphics were going. And none of Commodore's Amiga offerings came close to it... The then 7 year old Amiga architecture was useless for that type of game and game developers knew it. Software quality declined, sales of Amigas declined... Doom was released, the Amiga had no hope by then... The ball was already rolling... Commodore folds, end of story.
@bloodline
You're right, Wolfestein3D was the first game that marked the decline of the Amiga. It was the first PC game that made me interested in the PC. I used to play it on the 286 bridgeboard in my Amiga 2000, before that I mainly used the bridgeboard to decrypt Skychannel. By the time Doom was released none of my friends where using an Amiga anymore.
@all
And what about the
X68000? It was released in 1987 and had much better looking games than the Amiga, more colors (65536), more sprites (128) on screen. It also made use of many custom chips. Just search for X68000 on youtube and compare that to the Amiga games of that time. The games where really arcade perfect conversions.
It had no impact on the Amiga because it was only available in Japan. If this computer would have been released in Europe I probably would have dumped my Amiga and bought an X68000.