The people I partially feel for are the vbulletin styling providers. As a rule i absolutely loathe styling so I know what trying time lie ahead, I think it will be easier to style but others may not adapt but i'm sure the old timers who have been in the commercial game will (I hate any kind of styling for any forum software) so it will be curious to see how the top vbulletin commercial stylers handle this and adapt to the new code structure in 4.0.
I knew there was a good reason why I never got into the styling game.
Interesting times ahead and will be even more interesting to see who adapts and copes with the upcoming changes.