While there are those that can literally find another game that they enjoy enough to stop playing WoW, I do not personally know a person who has stopped playing and never came back. When people say they are quitting or going to stop playing WoW, I take it in a general sense that they are taking a nice "break". I just had a friend that took almost a year off come back to just hang around (at least for now, anyway).
I'm sure you will be back for Cataclysm (at least), Xrystal.
