I belive that Elbox get A OS running with their Dragon accelerator something like 030 50mhz speed, mean no emulation just somekind of dragon.library?
They demoed it several times in Poland. http://www.elbox.com/news_06_11_11.html
That would be something, to get Dragon run A OS code without emulation, but much faster than Elbox did. It is also proved that it is possible make exe that can run natively both 68k and coldfire.
Elbox never released dragon because they couldn't get it working. Carefully choosing specific software to demo doesn't count.
Their demo was probably based on hand patched executables. Who is going to do all of that work to get every piece of software working?
Realistically the Amiga future is either fpga, arm or x64. Even the SEC 68000 versions that clock really high are a little pointless, they could at least build a 68030 if not a 68060. PowerPC is dead and gone.
And while you might argue we don't need fast processors as AmigaOS ran on 7mhz, go try it. Your web browsing experience will be very poor indeed. Software has grown to need a lot more processor power than was available even 10 years ago, which was 10 times faster than the fastest Amiga. Web browsing on the Amiga sucked in the 90's and it's only got worse.