Well if you read the accounts from people like Haynie it appears the 3000 was originally supposed to be the 4000, with a DSP. That means AGA chipset on an 030 back in thereabouts of 1990 unless I have read the accounts wrong. Thats the only thing I can see that would have helped, not cancelling machines with advanced chipsets and stagnating on Agnus/Denise/Paula for so long. People bought machines back then based on capabilities not OS. Only way to enhance the capabilities was with new chipsets on the Amiga.
So, a chipset that could compete with early VGA relatively well, years sooner. Many projects that could have kept Amiga competitive longer cancelled not because it couldn't be done but because of management.
This is why I don't consider any retread of the existing Amigas as able to make a dent to change the outcome. Maybe just forestall it a few more months with some added sales to existing customers but to justify it, the costs of retooling an assembly line have to be factored in. They had a retread, remember? the CD32. It didn't change the outcome.