I don't think they'll kill him again because we already know he can come back.
This season isn't bad but a lot of people are complaining that it feels sloppy and I gotta agree with them. Arya gets stabbed multiple times but survives. Dragon girl suddenly can control the dragons. I think the series creators need the books in order to make the show great and this season doesn't have the books to give them along.
I think controlling the dragons isn't out of the question because she is the mother of dragons and I believe people controlled dragons in the past. I don't really get Arya surviving the stabs, but sometimes you just have to go with things. I think its been a good season and hopefully these last few episodes deliver