> SAMxxxx, X1000 and X5000 users being able to use MorphOS

MorphOS does not run on the X1000 (and of the Sam4x0 series only on the Sam460).

> often MorphOS developers do offer their software to Amiga users as well.

These may as well be AmigaOS developers offering their software to MorphOS users as well ;-)

> possible that any OS replacement will fail to materialise at all in the long term

What does "OS replacement" refer to?