As Charania notes in his report, the Celtics have five players in Porzingis, Holiday, Jayson Tatum, Jaylen Brown, and Derrick White set to make $28 million+ next season. If left as is, it would contribute to a league-record $500 million salary bill.
I predict they do not trade any of those players during the offseason, but even before this report, I assumed Holiday and Hauser might be moved in order to take on a couple of expiring contracts. Porzingis is a FA after next season, and they are not going to keep an aging Holiday over Derrick White. I feel like those moves were likely to occur even if the Grousbeck continued to own the Celtics.
Let's just hope they don't take this team down to the studs, a la the Red Sox. I can live with a reset year or two because that second apron handcuffs teams from being able to do so much, so I get it. But their window for subsequent championships should largely be open through at least the end of Tatum's contract.