Alternatively:
Rondo
Wallace
For
Teague
Schroder
Brand (expiring)
Ayon (expiring)
2014 1st
If you don't like Teague, then you won't like this trade. When I've seen Teague play, I generally like him. He's not Rondo, but he's a solid NBA starting PG. Schroder also looks like he has a good future, and you can always trade one later if Schroder develops into a starter in his own right.
This clears about $12 million in cap room for next summer, once you account for the extra draft pick, and begins to put you into max free agent territory. Also, I bet this trade makes Atlanta worse this year, because Teague currently is better than recovering Rondo. It's possible they fall down in the standings for this year, increasing the value of their draft pick. Less likely that they fall into the lottery, but not impossible.
I personally don't thing I'd do it -- not sure Ainge would either. I do think Ainge would if Atlanta added an unprotected 2017 1st.