Currently there are four scheduled configurations on which to run the Amiga OS (60X, G3, G3 expandable, & G4), and that is not counting the option to just buy the board.
While I'm for licensing in such a market, actually, it is MorphOs that will not allow their OS to run on Amiga One. However, who would need it to run when you are running A OS4.X. MorphOS is just one of many ways to run Amiga programs on an non-Amiga architecture. Worst yet, it is an OS that will have little support for native features. I'd much rather run Linux and Amiga--which I can do on an Amiga One. Who wants to be stuck with a MorphOs machine? especially with questions related to support and the possibility of legal issues. Sounds very risky to me; there are dozens of other OSs out there that are more viable than MorphOs. Lastly, I'm also not sure how a G4 + a top of the line graphics card=obsolete.
This is not to say I'm buying an AOne--I'll wait for OS4.0 and for some extra change in hand, but, no, I wouldn't cosider MorphOS.