Some devices are definitely going to get left out of future development, that is a given, but it looks like Android will be going in two directions, with a high -end (Gingerbread OS) for the really powerful devices coming down the road, and a lower-end with (Froyo 2.2). Hard to believe that Froyo will be considered low-end, given its amazing speed improvements over 2.0 and 2.1.
But I can not say I am bothered by this; in that, I want them to develop the strongest, fastest OS possible; and if that requires hardware upgrades, so be it. Its not like the cell phone industry isn't built on the idea of regular upgrades.