I'd say that the crossover could grow quite considerably. For instance, I would love to be able to run AmigaOS4/MorphOS on a Mac G5. Really, it should be about harware/software independence. I believe that Amiga.inc are making the same mistake as Commodore, by tying the OS to the hardware. Really, if it's got the Zico spec (or better) it should run the following:
Linux
MacOS (licencing issue)
MorphOS
AmigaOS4
- now my only wish is to run them all simultaneously!