Sorry to be a cynic regarding the idea of support but look at Apple and how they treated Logic Audio and Shake users. They initially promised support to PC users after they bought up emagic and unreal, then *poof* left all the PC users high and dry forcing long-standing customers to either switch to macs or switch software.

Maya definitely would need a support community and I'm sure there would be, even if it's unofficial (like a forum). I've tried Modo and while I like what I've seen, I found it quite difficult to get used to after using Maya for so long (even with setting up the mouse controls to resemble maya's). It's like anything, though...work with it long enough and it'll all come together. Plenty of other 3D packages out there...I wouldn't discount 3Dmax being ousted just yet, either.