Another possibility is a whole new replacement mainboard, leaking batteries and capacitors are accelerating the demise of old boards and a new board could incorporate superAGA graphics compatible with new SVGA monitors.
This is actually something I have been expecting somehow, a replacement motherboard that fits the A1200 case - I suspect we all have them lying around? :-)
Earlier we needed tower boxes, but today the "everything in a keyboard" is actually quite OK. A motherboard with SATA, USB, SO-DIMM RAM, minipci, ethernet etc, and a way to hook the old A1200 keyboard (keyrah?) and tada...
The open question is what CPU-solution is the best. PPC ofcourse for MorphOS and OS4, but some of us would actually love a more modern m68k board. I've sometimes pondered on how feasable it would be to create a m68k replacement using a x86-variant and m68k emulation "on board" somehow, more or less hidden for any OS running on top of it ("Amithlon" on FLASH?).
Oh well, one can dream and ponder...
I'm typing this from a "everything in the keyboard" mac btw, an old G4 iBook I got cheap, with torn off display (yeah, really - torn off, by force!) :-)