I'd like to see an overhaul to the cap system, starting with these three rules:
1. Set a minimum salary at 0.0025 of the total cap (for a league starting at 132M, the min salary would be 330K). No more loading half the roster with guys who cost half that (like I often do).
2. Set a minimum veteran (4+ years of experience) salary at three times that amount.
3. Only the top 53 players (including IR) and dead money count against the cap. This would allow you to sign min contracts in perpetuity during the offseason and if you get into cap trouble.
Those three steps alone would put a dent in everyone's cap space.