The problem with being the Mets manager is there's really nothing to do except get out of the way and let the "talent" take over. That's how they designed this and it seems to be Mendy's game.
Naming Beltran manager would be crazy given how they are alreday blowing him. Can you imagine if your boss had his name on the building and you didn't get along? And then how is the front office ever going to fire him?
I think taking over this group would be best for an experienced manager, maybe Buck II.