This...was not the question. The question was whether or not their STAND ALONE GAMES were successful after they launched MMO's. They weren't. Even the ones that are financially decent (Star Wars for the name alone) were terrible games.
Huh? He gave you examples proving that such was not the case. FFXI, or Final Fantasy 11, was an MMORPG. FFXII and FFXIII(or Final Fantasy 12 and 13 respectively) were both stand alone, single player games, and both were highly successful and great games over-all.
Edit: Btw, for the first part: Metacritic gave FFXII a 92 rating, and FXIII a 83 rating. That's successful both in my book, and by the "professionals" that you touted for the Star wars examples.
Personally, I'm desperately hoping this doesn't affect future Single-player TES games. I won't touch this MMO with a 10-foot pole, I have absolutely zero optimism regarding the game and it's quality, you just can't capture the magic of TES games in an MMO. I don't want to explore Tamriel with other people, I want to explore it by myself. I want to experience the rich history that's inside the game, an MMO isn't going to have much of that, and what it does, all of us whom won't play the MMO won't know what little the MMO does introduce into the lore. I think this is a lousy idea, but I'm sure many of the casual crowd that Oblivion drew in are probably much excited over this.