I realy do not understand people playing MMOs who wants to have SP experience from the game...
Because more often than not when you're running up to the end game content, you're generally going to be plowing through it alone.
Whenever I played MMO and ended up playing it alone, it was a sign that the game sucks... Even in leveling up, I expect to have multiplayer experience... The more and more putting of SP experience into the MMOs, made me to stop playing them altogether, because I got bored in every single one I played in one or two weeks, and started to play SP only games again...