This is vital if you want to keep Mookie long term.
I know a lot of people think it's a given that if the Sox trade Mookie, he isn't coming back. I would call it very possible, but far from a given.
Keeping Mookie and going for it all in 2020 is more likely to bring a repeat of 2019 than of 2018.
Also, keeping Mookie certainly looks like bringing him back for 2021 is not likely at all, given how spending has been lately.
And even if all the stars align, and the Sox keep Mookie for 2020, and then extend him for 2021 and beyond, the team surrounding him is not likely to be all that great. The Sox would have about $140 million or so tied up in Mooke, Price, Sale, Bogaerts and Eovaldi and still have 21 roster spots to fill for an average about $5mill per player, assuming Henry keeps the budget that high. This would be substantially easier if the Sox had a few minimum wage players coming through the pipeline just to fill some roster spots. But even then, what does the final team look like? Having minimum wage contributing players would be idea, but there is a shortage of those in the sox farm right now.
However, if the Sox can pull of a Mookie/Price trade (or maybe even just a Mookie trade), they can hedge their bets against those minimum wage contributors by getting other options from the Dodger farm system or Padre farm system, not to mention reset the luxury tax penalties, and possibly even shed an enormous contract in Price and replace his spot in the rotation. If this all works out, trading Mookie actually solves a bunch of problems for the Sox that will happen after 2020...