It isn't so much that everyone is so high on him, even though I am. He's just one of the more logical predictions, since it's been rumored ever since Bishoff got "fired".
Another reason it makes sense for JBL to be the GM:
We have the ECW angle in full force right now, and JBL was the most outspoken guy against it last year. I'd love to see his work on RAW putting down the ECW guys.
I wouldn't mind seeing Bishoff back either, but that wouldn't really make any sense at all. It wouldn't make sense why Vince brought him back and it wouldn't make too much sense why Bishoff would even return after what Vince did to him last time.