I'm unsure as to how alienating your customer base is vital to your business.
I do see the need to put superficial DRM around products so as to attract "grey suited" investment, who believe that DRM stops piracy.
However, in the real world, we all know that pirates will pirate anything no matter what you do - it just takes time. However, when things you put in place to stop these pirates impacts on your legit customers experience and reduces the sales then you have gone over the top.
Just look - the guy who produced the first working AC2 crack was infact a legit purchaser, who just got fed up with the unreliable Ubi servers and just wanted to play a single player game he had bought when he wanted to play it - not much to ask really is it?
Ubisoft need to understand that this DRM is not acceptable, and people will continue to avoid their games on PC until they back down.
Just look at the price of all recently released Ubi games - all under £15 within a month of release - it just shows that the retailers cannot sell the expected volumes, and the reason isn't becasue of more people pirating the software, it's because there are a number of people like me who refuse to buy anything so restrictive.
I have no problem with protecting your software, but anything that requires an always on connection or online verification bothers me - what happens when the companies go bust, or switch off their authentication servers - I am left with a coaster! I recently installed Dialo 1 and 2 on my PC - I will not be able to do this with any of these games, unless they patch it out as they go bust or close off servers - and what are the odds on that?
In the end - keep this DRM and hurt your own sales ... no problem to me if you want to shaft yourselves.