All of those items will be collectively bargained. Your first point isn’t practical. There will be, IMO, mandated cross team scrimmages that will take the place of 2 preseason games. But, there will not be more hitting, less potentially.
Your last point already exists in terms of performance bonuses, which for some include X% of plays.
It is going to happen. Two greedy entities are going to figure out how to get more dollars for themselves (and hence each other). Extra bye week, limiting players to 16 regular season games will add so much intrigue and excitement to the league. I cannot wait.