To say that the deal the NFL has proposed is a good one isn’t saying much. If it were good, the NFLPA would have already voted on it but the thing is this, if they don’t accept it now, they may not get a better offer on the table.
Ben Volin of the Boston Globe has a really good write-up about the current state the NFLPA finds itself in and he lays out some pretty good reasons why the NFLPA may want to get this done sooner rather than later.
For the players association, getting a deal done now makes the most sense.