Leave the roster size alone, or maybe expand by one. Put no restrictions on positions. Heck, let 15 man staffs evolve. If reducing the bullpen and expanding the bench is really an advantage, let some smart GM/manager use it to their advantage. Let "market inefficiencies" resolve the issue. Let baseball be baseball. The last thing I want to see is baseball become more like football, with offense, defense, special teams, nickel packages, etc etc ad nauseam.