I find it kind of amusing that you are already declaring Brohm to be a "can't miss". I heard the same thing from my Purdue friends when both Danny Hope and Hazell were hired. A significant number of Boiler fans were openly happy to see Tiller retire, believing that he had stopped investing in recruiting in his last few years and that his pending retirement was being used by rival programs to scare away top recruits. Hiring Hope to be an assistant and head coach -in-waiting was going to return the Boilers to Tiller's glory years. When that didn't pan out, those same PU fans were declaring the hire of Hazell as the real solution. A successful FBS head coach, a proven recruiter, Ohio State connections, a guy whose ethnicity would help attract top-level minority and urban athletes.
Brohm has had success as a head coach at a level noticeably below P5. So had Hope, so had Hazell. I don't recall Boiler fans declaring either or those guys failures at the time of their hiring. In fact, just the opposite as I stated above.
Brohm might be the next Nick Saban. He also might be the next Darrell Hazell. A little premature to be declaring success I would think.