There's only a short thread about openamiga at amigaworld.net. There's a little support, but mostly it's "why go for lowest common denominator when we can get the full AOS4"? And "Amiga, Inc. is in charge; let them do the standard-setting." That sort of thing. I guess they feel the AmigaOne will be successful enough on its own to drive the market, set the standards, attract the developers and the buyers, and there's no need for market-maximizing things like openamiga.
I won't comment on how realistic that may or may not be, but let's just say it's consistent with the general rallying behind Amiga, Inc., Hyperion and Eyetech and disdain for competitors that you would expect. But again, it's a very small sampling so I don't want to make unwarranted generalizations about that website. ;-)
-- gary_c