I think it moves away from the whole ideology of the KitFox. It would be like having a 4 place Cub. It's just not a Cub anymore it's a completely different plane.
What a 4 place KF is, is a Hi-performance 2000+ gross plane. You're essentially wanting a Maule or 180/5.
I'll agree with the move to the model 5-7 but if they do make a 4 place KF it will just be one in name nothing else.