well, I think we're starting to see a shift in trends. look at Neverwinter for example, it doesn't try to emulate WoW. it tries to be Neverwinter Nights in an MMO package.
Still, the "western" MMOs have not changed all that much in the last decade. Cant talk about asian MMOs though. Not that I play them really there have been only like maybe 2 MMOs I tried and they might not have been even "true" MMOs, but I am reading a lot about it. Maybe there will be a huge change. But its a fact that more and more people actually enjoy the F2P model and it seems less people are keen about monthly suscribtions, the traditional MMos seem to die slowly. The reason? Not sure, but I guess its exactly because people are saturated with the content from MMOs, knowing they get bored very fast and then you sit on a game you payed a lot of money for. F2P games usually offer you a chance to see if you want to stick around long enough. Thats a huge advantage! Take World of Tanks, even if the game has no "end game" and its really boring gameplay they did a great job on making people addicted. Took me a while to realize that because the game is fun, but absolutely boring in the end.
Take World of Warcraft, when you ask a lot of the people why the still play it even after so many years, you will hear a lot "because my friends play it", its simply fun to socialice and WoW is doing a great job here, for its time the gameplay and idea was also pretty great. But even WoW is not as popular like it was once, each expansion is selling less and players do move on.
Maybe NW will do things different. But that remains to be seen. A lot of MMOs said they want to go a new way just to crash on their ideas.