They're kind of stuck shuffling deck chairs. They could do worse than adding a guy with Klay's shooting and championship experience.
Fwiw though they should be trying to get Demar imo. Demar is going to one of the LA teams, is still really good at what he's really good at and at his age more likely to take a reduced role to have a shot at winning. Demar's biggest problem has always been that he's not the guy you want carrying you in the 4th of a playoff game. As a 2nd-3rd option though? Dude has generated some big moment before, just can't do it consistently.