Humphries is now a passable backup being paid starter money.
Wallace is a better PF than SF, but probably can't play there due to a history of concussions. As a PF, he is now a passable backup being paid starter money. As an SF, he is not now a passable backup being paid starter money.
Either, or both, could bounce back from down seasons, but I doubt either would ever be worth the money they are currently being paid. Danny will not be able to shift Wallace as other than a contract with other assets attached, nor will he be able to trade Humphries as other than an expiring contract before the trade deadline. At the deadline, Humphries might be a guy that some quasi-contender picks up to help them in their playoff run, that's the only way I see Danny getting much value from him. Same for Wallace...in two years, but not before.
Gee! I'd love to be wrong about these two.