I'm thinking whether there's a possibility to trade Walker (possibly within this likely sign-and-trade construction). It's not easy to trade such a big contract, so maybe it works when there are already big money transactions flowing.
What the Celtics need is a guard and (power) forward replacement for Walker and Hayward that fit the timeline of Tatum and Brown. They don't need to be (former) All Stars like Walker and Hayward, but guys who are good NBA players who are not (huge) defensive liabilities, can stretch the floor (a bit), don't require huge usage, available for trade, not in line for a massive extension and have a salary that doesn't put us in the luxury tax.
A couple of options
Guard: Rozier, Dinwiddie, White, Fultz, Rubio, LaVine, Hield, Fournier, Ross
Forward: John Collins (?), Markkanen, Otto Porter, Aaron Gordon, Randle, Barnes, Nance Jr
It cost Philadelphia a future 1st and a 2nd rounder to trade away Horford. Thus the cost of shredding salary isn't incredibly high. Still we'd need to give up some in such an exchange. Since Theis is in line for an extension next year (and Celtics don't want to pay up for centers, while somehow Celtics player tend to be overpaid in the open market) he's a good option. We can trade a 1st rounder. Also Edwards and Ojeleye may still have a little value. In the deals below there are favors for Charlotte as well, thus they can give up 1st as well.
Below I'm not going to make specific deals, but just basics of a deal. Seems to me like New York, Orlando, Chicago, Sacramento are possible trade partners (and to a lesser extend San Antonio and Cleveland).
The cheapest and easiest way would be with New York (though most people won't be thrilled with Rozier and Randle):
To Boston: Randle, Rozier
To Charlotte: Hayward
To New York: Walker
With Orlando (would be funny to develop Fultz into a legit starting PG, this deal shouldn't cost us any other assets):
To Boston: Fultz, Gordon, Zeller (expiring)
To Charlotte: Hayward, Theis
To Orlando: Walker
With Chicago (lots of options with the Bulls, but also difficult):
To Boston: LaVine, Markkanen, Porter (expiring)
To Charlotte: Hayward, Theis
To Chicago: Walker, Zeller (+ assets)
With Sacramento (looks weird, but in theory it works I think):
To Boston: Hield, Barnes
To Charlotte: Walker, Hayward
To Sacramento: Rozier, Batum
Are these all garbage proposals? Should we just ride it out with Walker the coming years?
Do you think it's possible to acquire an All Star like Beal for Walker (+ assets) on a reasonable deal?
Do we need to wait a year to sort things out, try to build up value (for Walker and rookies)?
Or would waiting only make it more difficult to trade Walker's contract (until it becomes an expiring contract)?