Maybe I'm one of the select few on XF who's actually happy with vBulletin? Haha I wasn't a member on their website to see any drama go on, I bought my license beginning of this year and have had no problems with it. Support so far has been great between the 1 support ticket I had to submit and the one post on the community forums. Skinning vBulletin has a learning curve but I got it down extremely quick, I'm now running an attractive vBulletin 4.0 Suite board and it has yet to let me down.
As for XenForo "killing" vBulletin its highly doubtful but it will definitely be good competition towards it and competition is ALWAYS a good thing