In 30 years they might be playing football with robots.
Not because all the injuries will result in replacement of limbs with cybernetics, but because it will be untenable to do it will people because of the liability.
In 2012, some four thousand former NFL players have "joined civil lawsuits against the League, seeking damages over the League’s failure to protect players from concussions, according to Judy Battista of the [New York] Times".
FOUR THOUSAND. Iron Mike Webster's family got $1.2m for his injuries. Multiply by 4000? Over four billion dollars.
This will have a profound effect on NFL football as we know it.
In the 1960's, NFL football was a relatively minor sport. 45 years later it dominates. In 45 years, it could again be a minor sport.