Got to wonder if this causes Ubisoft to pull out of the PC games market. As not worth the hassle of supporting PC market if revenue is too small compared to hassle of DRM and alike.
The $$'s will be worth the hassle regardless of this hiccup, i call it that because one way or the other it will be different next time... either it will work or they won't use it.
Assassins Creed is massively popular and $50-$60 in the US i'm sure they'll be raking it in regardless of the current problems.