2 thats your opinion and your welcome too it. I dont agree but there's no meaningful way to debate eachothers perceptions so not much point arguing about it.
3 I stand by my flipant coment in the post you quoted. Yep MOP is going to come out a month after GW2. Yep folks are going to run off and play that instead. And yet as we've seen every expansion and patch in WoW history there is a very clear sin-wave in avrage player activity level. Patch or expansion hits and everybody swarms the servers and plays it like crazy. A month or two down the line the hardecore players finish all content and start loging on less and less when it is not a raid night. Another couple months down the line and the casuals reach that point. By the time you reach the point where theres a couple months to go till the next patch peak activity is around half of what it was right after the patch or expansion. So yes there will be plenty that leave for MoP. I expect many of them will be back in 2-3 months while they wait for the next patch.