Players aren't as highly valued as their proponents hope, but they also aren't as lowly valued as their detractors fear. There will always be teams willing to take a chance. For example, Doc Rivers loves Tinsley. I'd bet George Karl is sure he can get the most out of a guy like Jackson. GM's fall in love with talent, and always believe problems had off the court will disappear in "the right system".
There are always deals to be made. However, as Able pointed out, TPTB have to be willing to trade them first.