There's more Amiga users under emulation than real HW. Seeing how Win/FS(UAE) are improving on PPC emulation, I suppose that these users will go that way instead of staying in pure 68k land. We just need to wait for a Cloanto deal with AmigaOS 4.1 Final.
I still think however that an improved 68k based Amiga OS has a future for real HW but most importantly to FPGA implementation.
Kamelito