We can't tell for sure. Most of the new age MMOs..how shall we say...run into the big problem of lots of hype, follow by subscribers fleeing away due to shallow content.
Leave action oriented MMOs to those that follow content based business models like GW,GW2 that DLC it. People who use subscription based or FtP based fail badly when it comes to longterm.
Of course it doesn't help if you make a crap game in any genre.