Not necessarily. Requiring a 32" minimum seat pitch would mean removing just 1 row of seats (6/150) which would only be a marginal cost increase of 4% -- hardly a fare explosion. WN has better seat pitch than AA, and their fares aren't exploding.

A minimum airline product needs to be established instead of the continual sacrifices in service, quality, comfort, and choice. If that results in fare increases, then so be it because we get what we pay for. Some routes probably do need to go under. If a mainline carrier is now outsourcing what used to be busy routes to regional carriers, then they probably should consider letting such routes go.