Urban Meyer took a top tier athlete in Tebow and built an offense around him that fit his abilities. Most other coaches probably would have tried to convert him to another position. Braxton Miller has more passing ability than Tebow but just lacks consistency. One throw is a perfect 35 yard back shoulder pass to the sideline in tight coverage, and the next one overshoots his target by 10 yards.
Urban Meyer's style of spread offense is not contradictory to the style that OSU runs so the transition is not going to be severe. If Urban is smart he'll take advantage of the OSU playbook and introduce his own methods in tandem so as to make the transition as smooth as possible. There's no reason OSU shouldn't be back to a 9+ win team next year if they get a solid group of new recruits this year. I suspect Urban will come up huge in recruitment for them this year.