This is not an activity for everyone, and I despise that you want to take this experience away from us.
We didn't make forum posts complaining that BwD was too hard for my 333 blues. We executed the fight to perfection to kill it after 2.5 hours. Check the achievement, within 1 week of release I earned the parasite evening achievement. That's what it took to kill the boss in the gear we had.
I respect your right to be casual, and kill things on your own time commitment. I don't respect your right to infringe on my decision at times not to be casual and kill things on my own time commitment.
Let's have some mutual respect here. You kill the boss when you want to, and I'll kill it when I want to. Likewise, you do pet battles when you want to, and I'll just ignore the fact that they exist.
Again, I pose the counterexample of not releasing any other content in MoP until raids are cleared. I respect that doesn't sound exciting to you. There's no need to throttle any content - raids or other content. Do what you want to do, when you want to do it. No one is stopping you, and the choice is your own on what to do when MoP comes out.
I don't advocate anything that removes choice.