It is actually very similar to our Celtics team today. Tatum and Jaylen are both under long term contract and are young enough to withstand some rebuilding right now. But within a few years, that window will be closing. They will older and less willing to rebuild + their contracts will be running down so they will be actively analyzing their options.
That is what happened with Melo and he decided he did not want to rebuild. So what we are seeing with Boston now could be the example of what I thought Denver should have done in 2009 versus what they actually did which was go all-in on a bad hand.
I agree with you that the Celtics are in a similar spot, and I entirely disagree with your prescription for how the Celtics should proceed.
The Celtics have just 3 seasons with both Jaylen and Jayson under contract remaining. That means two years from now, Jaylen will be entering the final year of his contract before he has the chance to enter unrestricted free agency.
If the Celtics aren't already an exciting and talented team for Jaylen to be on at that point, I have no confidence that he's going to be committed to stick around. The Celtics may very well be in a position where they have to seriously consider trading him at that point to avoid losing him for nothing.
Tatum might follow a year later, for the same reasons.
What do you think is going to happen if the Celts are a 40-45 win, 1st round exit team the next two seasons while they develop a young supporting cast? Do you think Jaylen and Jayson are going to remain committed to being in Boston while they watch their peers (Mitchell, Booker, Trae, Simmons, Embiid, etc) make deep runs?
If you have stars under contract in their prime, you can't afford to throw away seasons if you have any other choice. The Celtics already lost a year this season with those two under contract due to COVID, injuries, and general roster mismanagement. If they embrace a soft rebuild / reset now, how many good years will they have with Jayson and Jaylen once they've completed that rebuild? One?
Honestly, I think the Celtics are in a very dangerous territory right now where if they can't figure out a way to set this right and put themselves in a position to at least be competitive with the other top teams within a season or so, they probably have to consider trading Jaylen and maybe even Jayson. The alternative might be waiting a year or so and then getting forced into making a much crappier deal (as we've seen some teams make recently) due to a trade demand.