This isn't MorphOS bashing, its just realistic. Developers will start coding for MorphOS' Q-box, which is essentially no longer Amiga (granted, ExecSG isn't the same as the old core, but it does retain the original design structure if I'm not mistaken, i.e. the scheduler and so forth).
Then I feel you are mistaken... Since Both AROS and MorphOS have the Original design structure...
Whereas OS4 provides a new library calling mechanism, in an attempt to move the AmigaOS away from Jumptable based libraries, to a DLL style link library system.
This is not a bad thing at all, but something to remember before one gets all sentimental about this.