Well, I did think your example stank. Now I know why.
Trade for Amare, you kill all roster flexibility between now and the summer of 2015, when Rondo becomes a free agent. I wonder if he'd really stick around after going through the motions for another lost season in 2014.
I'd prefer to wait a year to trade Wallace, if necessary, use the TE next offseason, and continue to accrue assets. Not wager on a trade that might happen two years down the line.