Considering it took Garrett 4 years to figure out that a running game was the key to success, I wouldn't keep my hopes up. Best case, Jerry gives Garrett a 5 year deal, they return to 8-8 for the next 4 years.
Murray took A LOT of punishment this year. Running backs seem to flame out pretty early, too. I'd pay him, but I wouldn't give him a long deal. I'd be shocked if Jerry doesn't take care of Dez.