Since Linux runs on most next-generation hardware in some form, I think the Arix kernel's ability to bridge between AROS software and Linux drivers is the most plausible solution for unifying the Amiga community. All it would need (assuming the project is not delayed indefinitely) is some cross-compatibility bridges like OS4Emu on MorphOS to be able to run other applications AmiBridge-style as well.
My preferred solution to the driver scenario is actually to require everyone to give up on GFX cards that are incompatible with the Amiga chipsets and use FPGA technology to accomplish hardware compatibility. 
After all, if we could get next-gen performance out of a classic model Amiga, why bother with all the graphics card kludges?
Not that there is much point to this. Once unified, the Amiga community may still fall flat on its face.
Or Aeros, which allows you to run Linux apps as well. two different approaches, Arix hides the linux kernel, Aeros allows you to use it. To me having the ability to run Linux apps makes me want to dedicate hardware to it.
We all want different things, it would be hard to see one OS providing everything we want.
