Hard to say, but the spending of the Sox and a few others really isn’t the issue to either side.
Not sure why the owners think imposing more stringent penalties on themselves is the issue, especially on the teams already voluntarily playing around the limits.
And the players should be less concerned with the spending of the Red Sox, Yankees, Dodgers, Mets, etc. Even if you argue it will limit/prohibit/prevent those teams from exceeding the limits, they’re still the top spenders and are only going to impact 78 players. The primary concern of the MLBPA needs to be creating more spenders at that level, not limiting the teams already doing what they want anyway…