Brohm would be an idiot not to take the job (assuming he's offered which, I'd bet the house on). When does the opportunity to "go back home" present itself again? You only get so many "dream" scenarios in your life time, you have to take it/them when you can.
If Brohm wants to go home it's only a 2:45 minute drive from West Lafayette. He should stay at Purdue. Besides, who wants to go to a school that fires a coach averaging 7 wins a season?