The problem from the AmigaOS hardware side is that it relies on one firm for both the northbridge and the motherboard design. For the moment there are no problems.. But what about the future?
There are a lot of "what if's" that could pop up in the future, and for the moment (and who knows how far beyond) there's no backup plan. (It's not like the PPC market had much going for it before, either.) If something should happen at/to Mai, Eyetech really don't have anywhere else to go.
Eyetech surely will never swallow their pride and go with a (GASP) Genesi product.