We haven't had confirmation yet whether Castiel pulling him out broke the deal. Though, I'm sure we'll find out soon enough.

And I'm not saying that they would actively take him back. If Dean is out, he's out. Hellhounds wouldn't come after him. What I cam curious about is when he dies, does that mean he goes back? If his contract is in tact, then I would say yes. If it's not, then he doesn't have to worry about it.

I still think it would be awesome if it was still in tact and that the good side was a bit on the shady side by taking him and using him. Doesn't mean he can't be redeemed from that choice in the end or find a way out of it, but it would make for some interesting conflict and tension :)

But if the deal is null and void and the Hell thing is just a fear of his, I'm sure that will be handled well too.