Let's say the Red Sox deal Mookie this offseason. It would break my heart, but let's say they do. He has one year left on his deal. They'd get SOMETHING useful for him. Let's say they deal him to the Dodgers for OF Alex Verdugo and another prospect (I'll throw out Diego Cartaya, their #2 catching prospect). Verdugo is their #1 rated prospect (or at least was going into 2018), and he hit .294/.342/.475/.817 (114 ops+) in 343 at bats this past year with the Dodgers. They are definitely a "win now" team and even though Verdugo is a nice promising player, he's obviously no Mookie Betts. JD stays with the Sox. So here's their basic core.
C - Vazquez (28) - 482 ab, 23 hr, .276/.320/.477/.798, 103 ops+
1b - ?
2b - Chavis (23) - 347 ab, 18 hr, .254/.322/.444/.766, 96 ops+
3b - Devers (22) - 647 ab, 32 hr, .311/.361/.555/.916, 133 ops+
SS - Bogaerts (26) - 614 ab, 33 hr, .309/.384/.555/.939, 140 ops+
LF - Benintendi (24) - 541 ab, 13 hr, .266/.343/.431/.774, 100 ops+
CF - Bradley (29) - 494 ab, 21 hr, .225/.317/.421/.738, 90 ops+
RF - Verdugo (23) - 343 ab, 12 hr, .294/.342/.475/.817, 114 ops+
DH - Martinez (31) - 575 ab, 36 hr, .304/.383/.557/.939, 140 ops+
I really really hate to see Mookie go. I hope he doesn't go. But if they can get something like Verdugo (and who knows about that) in return, they should absolutely be able to field a very very good offense and use the money to improve other needed areas of the club.