So I've come to a sad conclusion:
This will be the first WoW expansion that I don't buy.
I quit playing over a year ago not because I found the game boring but because I wanted to start playing other games and getting some variety, and I just wasn't spending enough time with WoW to make it worth the $12.99 / mo that I was paying. I recently got a free week from Blizzard by email so I've been toying around Azeroth again for the past week, and there are many improvements. The game is still damn fun, and I love it, and I'd love to play it for a few hours per week again casually, BUT a few hours a week is not worth $156 per year to me, plus $40 for a new expansion. It's just not.
If the game went F2P or even had the monthly rate reduced substantially then hell yeah I'd be playing again in a second. I'd love to just casually do pet battles and quest everywhere trying to get Loremaster, I've never minded missing out on content simply because I don't have the time to do everything in game. The investment just isn't worth it to me anymore. And that saddens me, as I've bought and played every expansion so far. Some I've played sparingly (Cata), others I've played hundreds of hours in. Ten years ago I was a better than average raider pushing into the likes of MC, BWL, and all the Burning Crusade raids. As the game evolved I switched to a more casual style of play, and gradually slowed down so much as to justify cancelling my subscription.
It's not that I don't want Warlords of Draenor, it's just that I can't justify the expense of playing it nor the time required to make that expense worth it.
And that makes me a bit melancholy.