TrippyHippy
Hero
Not to pick on you, Trippy Hippy, but we could substitute 3e for 4e in your post about dividing the fanbase. We could then insert 3.5e as well, because that argument was made more than once on these very boards back then. I do, however, agree with you nearly completely regarding ease of grouping with D&D and I too laud WotC in their stated goal of unifying the fanbase. I really hope they pull it off.
Well, no you couldn't for the reasons I have stated above. 3e, when it was released (2000), brought the D&D community together unlike anything we had seen since it's heyday in the 1980s. It also led to a number of new rpg companies being formed in the light of a new d20 market (Mongoose, Green Ronin, etc)
You could argue that 3.5e (2003) was getting divisive - as it annoyed some game companies whose own books were based on 3e. In turn, this lead to a lot of game companies ignoring the original idea of their books supporting the core D&D Player's Handbook - and instead started producing their own core books as alternatives. It's also where retroclones - like Castles and Crusades starting to make an appearance.
Even then, though, this is a trickle compared to what eventuated with 4e and the emergence of Pathfinder (which has essentially taken half of D&Ds customer base). On top of this, the various other factors that occurred at the time (the confusion over the OGL/GST; removing all the D&D archives from drive-thru, the lack of online utilities support that was mooted, etc) have all contributed to a fan base that is so far from being at ease with the situation that it beggars belief that anybody can claim it wasn't divisive.