If rest is as big of deal as everyone says, then new rules could be a big help. It COULD, and I stress could, lead to higher staffing requirements. Still in the zero sum gain era of flying, that probably means capacity cuts. As long as people want $100 tickets, airlines will compete based on cost rather than quality of service (cabin service, overall experience).
I notices someone mentioned stricter PRIA records. Last year, I sent away for my entire pack just to see what was there. It had every checkride I took, but what else could they add to that?