The trade I had proposed a bit ago was this
Boston - Mitchell, Gay
Cleveland - Smart
Utah - Sexton, Rob, Grant, PP, 1st's (25, 27, 29)
I think that makes a fair amount of sense for all 3 teams.
That's laughably bad for Boston.
That is what a young borderline All NBA player that is signed long term costs. If Boston was trading Brown in a rebuilding type trade, what would the expected return be? Would you trade Brown for Smart, Rob, Grant, PP, and 3 1st's?
After that trade Boston would be with a bunch of open roster spots
Starters - Brogdon, Mitchell, Brown, Tatum, Horford
Bench - White, Gay, Gallo, Vonleh, Hauser, Thomas, Kornet, Davison, Kabengele
Projected vet minimum signees - Carmelo, Harrell, Dwight
Boston would have FAR and AWAY the best starting 5 in the sport. No one would be even close to that. You add some solid vet minimum ring chasing type players and you are off and running. And given the age of Mitchell, Brown, and Tatum that team would be at the top of the sport for over 5 years as long as Brown stayed put.
Go big or watch the Finals on TV over the same time period