I think Diaz could succeed here too, but I'm most concerned about how he would recruit. I think he would hire an innovative oc and would keep the status quo on D, which is what we need. However, I don't believe he would ever recruit as well as the top programs.
Our linebackers were never highly recruited kids. They were all easy grab kids in the state of Florida, usually south Florida. Additionally, his side of the ball failed to close on countless big targets (Shawn Davis, Heritage corners, Chris Henderson, Anthony Solomon) and were flatly ignored by others (Daniel Wright, Cyrus ***an, Brian Burns, etc.).
I would expect Diaz to keep some of the offensive staff as well. We've had our struggles with some of those guys too. To me, Diaz is a recipe for more of the same.