the 49ers have two younger guys I like that are kind of sharing the offensive coordinator role there... Mike LaFleur (age 31 Matt's brother) and Mike McDaniel (age 35) working under Kyle Shanahan. Either would be a good hire and the lure of a Jerry Jones-sized assistants contract, the full OC title, and full control of the offense might be enough.
Another "named" assistant they could jump on is Scott Turner (age 36, Norv's son). He is currently the QB coach at Carolina. He had previously worked at the University of Michigan, the Vikings, the Browns, and the University of Pittsburgh. He was a back-up quarterback at UNLV.