Gaara should stay dead. I'm getting real sick of them using some crazy Medical Deus ex Machina no Jutsu to keep any protagonist under the age of 60 alive after what is surely a fatal fight...
I don't care if he's Bijuu Butt Buddies with Naruto, bringing him back would just deflate what little drama this arc has had so far outside of three or so decently animated fight sequences.
Besides, Chiyo already used a bit of her life to save Sakura. Sakura wasn't fully dead, but Chiyo giving her her life energy to prevent her from dying shouldn't leave her with enough energy to bring Gaara fully back. He'd be like a zombie or need to sleep twelve hours a day with not a full energy tank... I can't imagine that Chiyo's wrinkly old body has enough life in it for two young people... If she does bring Gaara back, I'd like to see him just drop dead a year or two later, and people be like, "Yeah, he had half of a 90+ year old woman as his life energy, what did you expect?"
but then again... it does sound perfectly akin to some of the lame stuff they tend to throw into shounen series...