> something like Rosetta to keep old software running.

That's exactly the problem. A transparent CPU emulator *and* endianness converter (for little-endian host CPU) like Rosetta is not possible with MorphOS. Read what the father of MorphOS had to say about that issue some years ago:

http://moobunny.dreamhosters.com/cgi/mbmessage.pl/amiga/126048.shtml

For a host CPU that is able to run in true big-endian mode this would be a non-issue, though, like it is right now with transparently running m68k code on PPC MorphOS.

> you want to say it is not running very well ?

No, he wants to say that AROS executables compiled for a certain CPU ISA don't run on AROS for any other CPU ISA *at all*. The same would apply to MorphOS as long as it lacks transparent emulators for the other ISAs. And such emulator would only be possible for CPUs with matching endianness anyway (see above).