This has been a good thread and an interesting topic to consider.
For the sake of argument, let's say Schiano remained at Rutgers to this day. I think you'd be at a significantly higher level than you are today, somewhere around the Northwestern-to-Iowa level. Why? I don't think Schiano was a great coach (though he was better than often given credit for), but he was a terrific program CEO. I do think he had clearly plateaued at Rutgers, but that was because there was only so high he could climb in the former league. I always thought if he had a Big Ten to sell to recruits, he could've broken through to that stubbornly difficult next level.
By virtue of his inherent talent and the longevity he had by the time Rutgers entered the Big Ten, Schiano would've brought the gravitas to your program that it needed to make a successful entry into that league. Without it, the capital Rutgers football had earned by then was quickly and foolishly spent by the totally inept Flood - a true jackass in every sense of the word. By retaining him as head coach, Rutgers squandered its one and only opportunity to make a splash with its entry into the Big Ten, which can (obviously) never be regained.
Flood should've never been hired, and then it took too long to get him out, and by then, the damage was done. None of that ever would've happened with Schiano, the CEO of Rutgers football, at the helm. Rather than leveling, before plummeting and eventually flatlining, he would've had you ascending - at least to a point, but that point would be good. He never would've won a national championship, nor seriously even threatened for one, but he would've had you positioned to be a respected part of the league with a chance to compete for Big Ten titles in peak years, and rarely faced the embarrassment of 2-7 or 3-6 seasons.