FWIW, RA stated about a two years ago that those bag fees would be beneficial when it came to contract time. (Stated when pilots were complaining about the baggage fees)
Also, fares were successfully raised 10 times this year and I believe 8 times last year. The baggage fees are in reality one fee they got to add on and did not have to decouple the dollar amount from the ticket price when they added the baggage fee.
Now if we could get a domestic fuel surcharge removed from the base fare, then we would be in business. Write your congressman