I hear what you are saying, generally, about it being a big ask for local kids to put on for the U in light of the current state of the program. But Duke is a really, really bad former player to list as somone who may not have stayed committed in this type of season.
Duke signed in 2012. In the Summer of 2011, the Nevin (Kill yourself) Shapiro scandal broke. UM went on to a 6-6 record, with a losing record in the ACC (embarrassing losses to a 2-win Maryland team, a 4-win BC team at home, to f$u, and nearly losing an embarrassing game to USF where we only scored 6 points)... we did manage to beat the Buckeyes that season, but that was fool's gold and they a horrible season themselves. Also, we didn't go to a bowl game as a self-imposed ban. So things looked pretty crappy for UM at that time.
Duke was the rare breed of kid who was going to go to UM to improve the local team. Period. As a fan, I sincerely appreciate that sort of loyalty and love to the local program. Expecting that from most kids is unfair. But it's all the more reason to put Duke up as a true local Cane.