While i think Timeless isle isn't necessarily the way WoD end game content will work, it's certainly the way forward. Now, they've basicaly got free 496(and 535 for a bit more work) as a means of catchup which won't be there so much next ex pac. But the exploration, rares, secrets, chests, etc is great. Now, Dailys have their place, but there has to be a low limit and it has to be the right content. That's fine. It's not fine when you have over 30 dailys per day you really need to keep up with if you wish to keep your character up to date.
I'm gearing a new 90, and i'm somewhat drawn to the lottery aspect of Timless isle, but the big point is last night i decided to not go there. What did i lose? Nothing. Not really. I can go there as much time as i want, when i want. It's all about the leisure of playing how you like. When you log in one day(Or can't play for a certain time) and you know there's a ton of dailys waiting to be done, it's not really a choice.