This is exactly true, which puzzles me with why MMORPG companies constantly copy WoW instead of innovating in new ways.
Personally if I had to guess I'd say SWTOR probably had between 500,000 and 750,000 subs now (from a low of ~500,000 to 400,000 just befoee F2P) however I don't think it is rising going from server numbers.
because inovation is too risky. Gamers always say they want something new and innovative but the truth is quite the opposite.
Whats the best selling FPS franchise? Call of Duty. Meanwhile innovative FPS like Killer 7, Stalker, Metro, Deus Ex and others at best do ok.
RTS? Starcraft is the most succesful while others that are far more innovative lose out.
TIme and time again players say they want something innovative but always buy the same old.
When it comes to MMOs you are talking about a HUGE investment so what do you do? You make it close to the industry leader while adding your own unique things.
Games that try something different like The Secret World, or SWG end up failing hard because the truth is players don't want that. Players want what they are used to.