Warband is my most played game easily. With 600 hours in so far, a lot of this is singeplayer and other mods, but probably 400 or so in cRPG. My second most played online game was BF2, played that for 250 hours. This game has had the most lasting appeal to me, part of that is because of the small playerbase, you know most people. So I wouldn't mind if the playerbase would get smaller, I think the death of cRPG is still far away.
Skyrim will not entertain for more than 100 hours for most and its also not an online game, so I don't think we have much to fear from that.
Battlefield 3, mehh, there have been other high profile games that cRPG survived, some people will dissappear, I think a lot will eventually come back to cRPG. Only Warband 2 might really cut into the cRPG playerbase, I think most cRPG will gladly go play warband 2 and I hope chadz will too.