Tough to say where Amiga would be if only one of the line of people who caused it to fail hadn't been there.
Amiga survived as long as it did because it was so far ahead, but out of the gate it already stagnated with no real advance from 1000, 500/2000 to 3000, a 5 year span of time. While Amiga was staying to mostly the same capabilities both the Windows PCs and Macs were slowly and steadily gaining capabilities and was a continuation of the 'rudderless' careening around that started at Commodore after the 64.
At best if all things had been improved including no Medhi Ali, Amiga now would be in the same state as the Mac where its parent company could only really sustain itself by coming up with products in areas where the clone market isn't. Windows didn't win by being better than anything, it won by being easily and cheaply able to be purchased by a wider market and rode the wave of hardware produced by many manufacturers into businesses and homes.
