Well put. The Yankees right now essentially have one bona fide SP. The others who follow him are a blow up waiting to happen against the best of the best (aka, playoffs).
deGrom pretty much gives them the best chance to lock up 3 championships with the team control they'd have (not guarantee but best shot). Is that not another dynasty? And he can probably be locked up longer if given a fair offer. With Severino and deGrom in a short series and their offense and bullpen it's as much of a lock as you can hope for. So yes, they should back up the truck while holding onto Gleyber.
Andujar, Frazier, Sheffield and Florial or German should be enough to satisfy them.
This gives the Mets several building blocks where they need them (3B, CF, SP) so that we're not looking at a 5 year re-build, while holding onto Thor, Matz and Wheeler who seems to be coming around finally. Then Nimmo and Conforto (if his shoulder doesn't fall off) go back to corner OF and who knows - maybe glassman (Cespedes) can be the answer at 1B.
They do need to move Cabrera and Familia immediately before they go on the DL again, particulalry Cabrera.
Move Bruce (eating the contract) for whatever low level minor leaguer they can to further stock the farm.
Move Blevins to whomever will take him for something.
Now, with all that said, nothing good will actually happen with the current ownership in place. The Mets will be hapless for years to come (save for an unforeseen anomaly like 2015) as long as the Wilpons (and that dopey son) are in charge. How do you defend contracts like Swarzak and Vargas. I mean, 2 years??? Come on!