Nope. For me, the Ulduar era made quitting really easy. Came back for about a week during ToGC. Came back several months later, was gone until Mid Cata, and then was gone again until MoP. After that first time, stopping until something catches my interest has been really really easy. In the case of Ulduar era quitting was easy because that was extremely dull, Cata quitting was easy because there wasn't anything to hold my interest, MoP quitting is easy because I haven't invested much time into it or anything but I can actually see that with this content it would be entirely possible to get hooked.