A few easy fixes:
1. Eliminate the reviews for all scoring and turnovers. If an issue, let the coach challenge.
2. Eliminate the booth reviews within last 2 minutes. Again, let the coach challenge.
3. Set a time limit of 30 seconds.
4. A 3 person review team - 2 of 3 required to overturn. This is the ref on the field, 1 in booth at the stadium and 1 in NYC.
5. Give coaches 2 challenges per half. Use them or lose them.