Personally I was thinking of being able to recreate some discrete chips with breadboards.

Then again MOSIS has prices down to a few thousand/square millimeter. Since current gen stuff is so much smaller, that's probably <$100 for the more complex chips from the 70s, & 80s.

The best I think we'll get is some Amiga/Commodore build it yourself kits That weren't possible before because of out-of-production chips.

Even software emulation would be nice.

for completely digital an fpga would do the job. Analog chips well that's a different.