For all the people whining about this, they're just going to go right back and play these games as soon as they become available again.
I fail to see how this is a big deal, because this is the same thing that could happen to the likes of Steam, Origin, Xbox Live, PSN, and even the Wii to an extent.
Overall, server migrations are very common to boot.
I wonder how people would react if Steam had to do something like this instead of Ubisoft. I just think people are so quick to pounce on Ubi just because it's them.