Common knowledge: The amiga wasn't powerful enough as a gaming machine anymore
Why it's wrong: Sure, the 68000 with 1 meg of RAM wasn't cutting it in 94 anymore. But then, we had 68060 processor cards, RTG video cards, loads of RAM etc available.
It's a travesty that virtual no games ever took advantage of this equipment but that's a shortfall of the developers, not the machine itself.
Wrong. You're talking about an Amiga that existed in *theory*. In practice, they were horribly expensive, and you could get a higher spec PC for less cash than a high spec Amiga.
Common knowledge: Doom killed the amiga
Why it's wrong: Doom was released in December of 93. Commodore declared bankruptcy in April 94. There's plain not enough time for an entire platform to go from doing well to dying off, based on one game in about 4 months. (Doom was massively important in fuelling the PC as a valid games platform, but that's an entirely different story)
Wrong. Doom in itself didn't kill the Amiga, but the technology it used did. Playfields, copper and sprites was hot 1985, but 100% useless when texture mapped 3D games became mainstream.