(ISV hat)
I perceive this as an advantage for OpenGL 3.0 compared to the status quo of GL 2.x - since it has so much integrated functionality, if an IHV commits to doing 3.0, there’s a well understood useful set of features that all have to be there.
edit: with respect to the discussion about AMD support I am glad to see their plan to do 3.0 and the 3.0 extensions listed at the BOF: