Sure... let's amigafy the crap of them and make it even less suitable for mainstream 
I agree that for the mainstream, they need the best Linux distro they can get/modify.
However, for little money, they could scoop a core 'alternative Amiga' community who would want to run on Commodore Amiga.
By contrast, if they have ONLY Linux, what is keeping Linux people on the C-USA product? It's not a 'community' but a tiny subset of the Linux user community.