I think we're going to end up seeing a lot more homebrewing and house ruling put into play now.
3e, along with the OGL, in some ways, spoiled us. For future reference, whenever in here I refer to "players," I also refer to DMs. The leveling, feat , and skill systems had their flaws, there's no doubt about that, but I think in many ways it opened players to the ideas of having a lot more freedom. DMs saw a rise in more codified rules for the things they were tired of always having to make up on the spot, and while many of the side and splat books had it's definitive bad sides, many others - like stormwrack - had it's very large ups with giving a bigger picture on how to do terrain that wasn't made of plains or forests. That leveling system I mentioned earlier gave players HUGE amounts of freedom to craft their characters.
I think this ideal of freedom is going to come out from this split, as people make their own ramshackle house-made systems, tying together fluff and mechanics from both Pathfinder, 4e, and perhaps other third party things that come along, tying it all together with duck tape and sending their own new system out amongst their players. It's going to be an odd couple of months, and it's going to get even odder once Pathfinder leaves beta and comes out in full force, but I think the END result will be the more experienced groups trying, in their own way, to repair the split by borrowing heavily from both groups; already we're seeing people who play 4e introduce their own takes on the new races, be it the dragonborn turning into lizard kin or what have you.
I can't say that I can predict how the hobby or community will end at, but I think it's far too negative to just shrug and say the split will be there together. Yes, there's a split, a wide one, but I don't think it will kill the community. Both loud mouthed hating on 4e AND unquestionable loyalty to 4e does make conversations very difficult for now, but it's still relatively new, and we're going to see the same problems with Pathfinder. It's my hope that we fellow geeks, nerds, dorks, and what have you, will eventually manage to stop shouting our hate, go back to smirking at whatever we find inferior - as we've ALWAYS done - and start collaborating to make new and awesome ideas.