I'd take more football/more teams in playoffs. ideal system IMO is teams win to expand the playoff format, if teams on the bubble are sitting at 10 wins then it expands and only the 1st seed gets a bye or something. A permanently expanded playoff allowing 18 teams or something in and leading to 7-9 teams regularly getting in is less than ideal.
This isn't covered in the CBA at all though, would need NFLPA buy in. Likely in the form of dropping 2 preseason games and an expanded playoffs if they were to happen would be used to recoup the revenue. NFLPA will already be scrambling to save face if 2 preseason games disappear next year - something the owners can do on their own per the CBA. Salary cap is going to be relatively flat for a 3rd straight year, it would go down if 64 games disappeared.
We'll see if that's how they play that trump card though, would rather see them go to 18 games than to expand the playoffs.