You want Oregon's current head coach to be our offensive coordinator? Yeah, sign me up.
And I mean, aside from Barnett's age (which is a huge issue), I think any hire will require Snyder's (at least tacit) blessing. In that respect, Barnett (even independent of his age) would be a non-starter. I'm fairly certain that Barnett and Snyder hate one another. I'd be surprised if Barnett ever coached again, but he certainly will never be K-State's head coach.