I don't see where the Vista Ultimate users are affected by this at all. If I'm not mistaken, Dreamscenes is still going to be an Ultimate only extra.
Stardock released Desk Scapes as a bonus to Ultimate and since the rights for it belongs to them, they should by all means target whatever OS they would like to. Remember...Stardock is in business to make money. For them to only target a small minority, Vista Ultimate users, with any program makes little fiscal sense.
Personally, I bought Ultimate for all of the additional features that it had out of the box. For someone to feel slighted by an "Extra" that did not ship with the program is makes no sense to me.
Also, I think this is a wise move on their part and would be willing to bet, the shareholders feel the same way.
Lastly, it's great that I can now use it on those 2 Home Premium copies I bought on the family plan.