I actually agree with some of your second comment. They do want people to stay subscribed for as long as possible because they are a business. If people stayed subscribed, Blizzard would have more profit, and therefore more money to hire employees--therefore getting patches/new content out faster. So it's kind of counter-productive for those people who want only new content to unsubscribe. (Yes this is oversimplifying everything--I'm an accountant and I understand this.)

Plus they have given us plenty of extra content to keep us busy for what 3 weeks or so. They have given us 3 new 5-mans (which we will play on normal, and then probably farm for emblems on heroic) and a new raid (not to mention all the bonuses for leveling characters and PUG'ing). But that doesn't mean they didn't work like crazy on all of that. Blizzard wants us to stay subscribed and actually experience the game we pay for. I go back and 2-3 man the raids in vanilla and Burning Crusade because I never got to see them, and I like to see all aspects of the game.