They've had zero negotiating power until this point. If they had not done this, what would the owners have done? Stalled, waited the players out, and assumed the players would get nervous, start bickering, as usual.
The owners opted out of the CBA quite a while ago, has the presence of a union helped the negotiations? Have you heard of any major concessions the league has made? All I heard was less % of revenue sharing, (after we take X amount off the top), hey, maybe two more games, and a rookie wage scale.
The players were not in a position of power, they HAD to do this because the NFL was certainly in no rush. Now, going nuclear might be bad long term for both sides, but the league REALLY doesn't want it.
It's funny, the CBA the owners opted out of doesn't look so bad now.