The Decline of D&D4e (plus, WoW?)

I don't know whether to trust these sales rankings, which claim that Pathfinder and D&D are matched in sales, but they must be sobering for WotC nonetheless. I suspect (with little real evidence) that it's due to 4e's lack of support. I regularly glance at ENworld's newsfeed, and it always looks as if Pathfinder has more stuff coming out. It may be amateur stuff, it may be low quality, but apparently it's enough to get folks to buy their products.

Meanwhile, part of me wants to buy the World of Warcraft expansion, which is coming out soon. (Apparently the 4.0 rules patch was just released.) Should I endanger my relationship to see Azeroth again? Can I trust myself to play long enough to say hello to old guildmates, to explore the new zones, and then quickly return to a blissful WoW-less retirement? My better angels are answering "no" to both questions.