Had Amiga survived it would have likely followed the Mac route,
At the point that Commodore went under the Amiga's days were numbed, hombre was not an Amiga and no other projects had survived. AAA was always going to be too expensive compared to the competition and it was going to be the last chipset with any backward compatibility.
It didn't make sense to waste money on AA+ either, the way the market was changing they wouldn't have made a profit.
By 1990 they'd missed the boat, it just took a while for the market to collapse.