that offensive mastermind would be hired away immediately

and you would just end up being in a perpetual state of changing coordinators.

I am firmly in support of having a head coach that can take over offensive playcalling as needed. I would prefer to try and hire an offensive minded head coach who can hire a series of good DC's (who you will not lose as often, most likely).

I find that to be especially true in the NFL, but I suppose in college it can be more flexible. At the end of the day, I think that what Bill Walsh said back in the day is still basically true--one offense, the coaches can scheme up yards and points, but you need the horses on defense in order to have a championship level defense.

Basically, I would hire an offensive minded coach and then recruit the hell out of the defensive side of the ball.