Games like these (based on popular ipo) are more enduring an popular than one might think.
Just take LOTRO from example. No one believed that fans will see Mordor. But there it is.
There will always be people that preach things like "The game is dead" or something like that.
The truth is - as long as the game is profitable and the new content is regular (new expansion is coming next year), things are going to be okay.