I have to second this. Vaughn Johnson was probably one of the most intimidating LB"ers of his time and was by far the most underrated of the dome patrol in my opinion. While, Fujita is and continues to be the most overrated player on this board. I think he has been solid and has produced adequately only to look better compared to the poor quality of LB'ers around him. Not sure how many other teams he would be starting for.
But, about the original post, I think it would be too much of an overhaul to try and switch defenses now. Our offense is primed for success and wasting another year of that trying to learn a new defense would be a mistake I think. We need (at least) 2 new LB'ers, a DT and probably 2 new corners to solve our problems already....don't add learning a new defense to those problems.