The teams I could potentially see both wanting Rondo, having a need for Rondo, and possibly packaging enough to get him are:
Atlanta
Houston
Milwaukee
Sacramento
I'd add Indiana to that list--I think LrBrd brought that to my attention, but Rondo to Indiana for Granger + Hill + possibly a third team involved makes a lot of sense for Indiana, provided RR is healthy and playing as well as he has by the trade deadline. His inclusion makes that team Scary, with a capital S.
The trouble is that trade doesn't hit any of the checkmarks that the Celtics need in order for a Rondo trade to be palatable.
Those checkmarks, by the way, are the following:
1. At least one 3-4 star prospect (e.g. Kanter, Barnes, McLemore, Beal, Noel, etc) or a high pick (top 5-8).
2. Unload one or more of the longer term veteran contracts (Lee, Bass, Green, Wallace).
3. A secondary asset, either a decent young player (e.g. Burke, Isiah Thomas, Steven Adams, etc) or a mid to late 1st.
I pulled Indiana out of a hat as a random guess. I decided that only a couple teams would genuinely consider trading for Rondo. I don't see the point in a lotto team going after ROndo for the same reason I don't see the point in the Celtics keeping Rondo. But also there's some teams that just dont' have any need for a star PG (Miami, OKC, Clips) ... Indiana makes sense to me. My guess is that we'd get a heck of a lot less than we'd want.
Boston sends:
Rondo + Lee + Bass
or...
Rondo + Wallace
Indiana sends:
Granger (expiring contract)
George Hill (maybe we can flip him to a 3rd team)
A couple scrub youngins like Solomon Hill and Lance Stephenson
+ a couple unprotected 1sts from Indiana (which would obviously be late 1sts)
That's my wild guess and I'm sticking with it. People are pegging the Pacers as a legit title threat thanks to Paul George making the leap and Roy Hibbert being one of the premiere centers in the league. Adding a 3rd star in Rondo could theoretically put them over the top... especially those who subscribe to the "Rondo is a superstar in the playoffs" myth.
Of course, that trade would leave a lot of us fans brutally disappointed. No star prospect. Just some late 1st rounders. But it's addition by subtraction... we completely bottom out with a top 5 pick, get a couple late 1sts and dump some bad contracts. If we trade Rondo, that's the crap I'm expecting we'll get in return. I dont' think anyone is giving up star prospects for him.
Fwiw, I think our best-case scenario is seeing Rondo take his sweet time coming back (playing like 30 games), Boston tanking to a top 5 pick and Rondo coming back 100% next year. But then there's going to be the hovering cloud of "will Rondo re-sign" hanging over us the entire season if the Celtics are still garbage post-tank.