This is such a non-issue. Its simply a marketing tool to potentially grab more money from corporate America, and keep the NFL in the public's eye all year round, instead of the 6 months they actually play.
And to further expand the topic: While I'm totally against any expansion of the Playoffs by adding more teams, I have become more and more good with the eliminating 2 preseason games and adding 2 more regular season games.
I know all the reasons against this idea, but the fact is, with the new CBA, players are doing less contact these days than they .did in my day when they had a 12 game season. Think about it. In my day (early 70's) training camps were about longer, and we had had 2 a days's for 5 weeks, and it was a rare day when one of the practices were with shorts and t-shirts. Back in the day teams teams would routinely practice in Pads Wednesday and Thursday...at least.
Now, 2 a days in TC are a thing of the past, and half of those practices no longer are in full pads. Then once the season starts teams are severely limited in how many practices they can have in pads. I don't recall the number off hand, but its well less than once a week.
The fact is that even with the addition of 2 regular season games, to go along with the elimination of 2 pre-season games wouldn't raise the potential for injuries that much higher for players.
Also for the players it is probably going to be the only way for them to see a significant increase in the cap, plus I am sure that any increase to the regular season will come with an increase in the roster sizes. All of which are good things for the NFLPA
BTW- teams could further limit contact and injuries to their teams by arranging more joint practices with other teams
