The minimum team salary, which is set at 90 percent of the Salary Cap, an increase from the 85 percent from last season, is $52.811 million. Teams will have to spend that figure of the cap figure on player salaries starting this season.
http://hangtime.blogs.nba.com/2013/07/09/2013-14-nba-salary-cap-figure-set-at-58-679-million/
It makes sense if teams on the rebuild HAVE to spend the money. What are the TWolves going to do with cap space? I suppose they could look to absorb other teams bad contracts for picks, but what's that market going to be like? Is the precedent set by the GS/Utah trade still relevant? I don't think so. The Warriors made a terrible trade because they were desperate. I don't see that desperation out there anymore. And if I do see that desperation, it's with teams like the Knicks or Nets, who have no picks to trade.
The last time the Celtics traded a lottery pick and got a superstar player in return, they were able to attach a bad contract that had 2 years left on it.
First, the salary floor isn't an issue. The Twolves could help out other teams trying to clear expiring contracts, such as the Rockets with Asik and Lin. Alternatively, they'd just sign a player to a large one year contract using their cap space. Their third option would be to sign nobody, and to just pay the fine (an amount equal to the difference between their payroll and the floor). All are better options than taking on Wallace.
There's a world of difference between an overpaid Wally Szczerbiak (who was still a productive player and elite shooter, averaging 15 ppg before he was traded) and Gerald Wallace (who averaged 5 points and looked like a corpse).