I think he's a college head coach. He'll have to prove himself at a smaller school or as an OC somewhere but he'll eventually get another chance in a major conference. That spread is just made for the college game and I think he's smart enough to stay where he can be the most successful.
Smaller than Tech? No way. More teams are using the spread in the NFL, including the most successful ones. We already know Leach can succeed despite talent disadvantages in college, so it would be easy for him to stay there. I think his unconventional uh, everything, would rub most NFL people the wrong way, so he may not get hired. But I think he could do a very good job if he was hired.