However, there are issues over retirement health plans and the notion of an extended season.
The extended season has always been the bone of contention; the players are being asked to play two extra games, at risk of injury - I believe with one less pre-season game (where injuries are less likely, for a variety of reasons.)
This may not seem like a big deal, however, if you start to average out the average length of a pro ball player's career, and the average earnings of the pros, as well as likelihood of a career ending injury, the extra games are a significant factor.
Minimum salaries in the NFL are about $300,000 dollars a year. A lot of money? Yep. But given that most players are retired by 35 years of age, they also have to be expected to invest it wisely - and the average NFL career is just 3.5 years.
If you or I earn $60,000 dollars a year, and work from the time we leave college at say 25 to an early retirement at 60, that's 2.1 million dollars, or about as much money as the average NFL player makes in his short career of 3.5 years at the average salary of $800,000 (2.8 million dollars).
Now think if he breaks his leg in an extended season his first year. He has only a few years to chase the chance of doing something he loves. After which, odds are, he goes back to the real world - sell real estate or cars, or construction, or something down to earth just like everyone else. Only a lucky few earn multi-million dollar salaries at the top end, and go on to movie stardom and endorsement deals like Joe Namath or O.J. Simpson.