"This does not affect my main channel!"
While it'll be good to see more JonTron videos, I'm going to miss him in Game Grumps. I have no idea who Dan is, but then I had no idea who Jon was either prior to Game Grumps. Who knows, maybe this will broaden my horizons. Or it might suck. It's too early to tell at this stage. Color me half disappointed, half cautiously optimistic.
This will probably be the first real "crisis" moment for the lovelies/cumfaggots (not an insult, the fans chose those titles themselves). The community will split into the "Jon era" and "Dan era" fans, and much flaming will be had by both sides. You can already see the beginnings of this in the comments section. As time goes by, the "Jon era" diehards will become smaller, but increasingly vocal. Eventually it won't matter though, as the channel gains newer fans prior to the "Dan Vs. Jon" split that are unaware of the controversy.
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Hot damn, that last sentence just conjured a truly epic thought. How awesome would it be if the show Dan Vs. had a "Dan Vs. Jon" episode? It will never happen of course, but it would be amazing if it did.