Depends entirely on whether it's a good game or not.

MMORPG players generally like to invest time into a game long-term, which means they're cautious to pick up and pay for something that might turn out to be a flop a few months down the line. It's one reason MMO's are a hard market to pick up and many developers avoid them, also why WoW was dominant for so many years even after multiple bad expansions.

I'd definitely play and switch game it if it was good, but I'd never just jump ship without being certain it was worth it.