I guess all you can really do is fix the bottlenecks. A minor chipset revision to be able to access more chipram and fixes/tweaks for exisiting problems. Not to be negative, but by this time amiga was too out of date to bother fixing in its then current guise, even '060's by this point in time shouldve been bare minimum. Instead of tinkering around that time it'd have been time to start things again as amiga had too many hardware problems/shortcomings to fix. Doesnt mean I didnt/dont love the classics, its just that by the time aga was out they where so far behind that trying to fix them was a lost cause and they shouldve instead made new machines rather than tweaking technology from the early 80's.
p.s. the above is written assuming this thread is talking about a successor to a1200/a400/etc. and is based on realistic ideas. If we're going a little more into the realms of the hypothetical then some sort of 3d acceleration seems a good idea (even '060 + reasonable (even for the time) 3d acceleration could give amiga gaming a kick in the pants), 16 bit audio, useful sprite hardware (even "fixed" aga level sprites would be nice (ie. 8 useable 64pixel wide sprites)), at least 16 bit screenmodes (2x8bit playfields would be nice), the ability to mix and match playfields depending on bit depth (ie. 2x4 bit playfields + 1 8 bit for triple playfields, etc.). It's a shame Amiga hardware never went that one extra generation. With some small alterations to end up with the type of ideas I suggested (which are still very dated) my creative retro impulses wouldnt need to be so compromised.
