I'm actually with Ubi on this 100%. I actually expected this kind of system to pop up years ago. Because if this works it could stop piracy, and that means finally more real PC games. Let's get some facts straight here:
Every single person with a capable gaming PC has an internet connection, so no problem there.
Games like WoW require you to be online to play aswell, and nobody complaints there.
Because let's face it, piracy has gone over the top. We al saw the estimates from bittorent from last year and that was just a fraction of the problem. Again don't blame this on Ubisoft, blame it on the people pirating games!
I really think we've reached a threshold here, and there are only two options left for alot of game developers: Get this or a similair system to try and stop piracy, or mostly abandon PC gaming.