0: http://www.mrmoneymustache.com/2012/01/13/the-shockingly-sim...
This is the one thing that has always struck me as odd abut the FIRE community. FIRE is a good goal but it's highly abnormal for people to retire early with these very low annual salaries for themselves. Sure, it works if you're a single childless 30 year old. But you also generally have to be comfortable staying single and childless if you're going to "retire" to $25k/year.
Also, even if people budget a $25K/year retirement there is always the possibility of needing long term nursing home care in the last years of life. (Say, if you're a football player that suffers dementia later in life.) Depending on the quality of care, that can wipe out even a $1M nest egg. It's a big financial concern at that age. It's not covered by insurance the way that, say, a heart attack or stroke is.
Doesn't the average NFL player have a life expectancy of 53-59, and you can only collect the pension after 55? They can move it foward starting at age 35.
Cynical me says it's a political nothing burger.
I would sort of expect that the NFL Players Association had something to do with establishing it.