If anything is going to happen, it's going to have to happen very quickly. Riley needs the cap space now and if we wait, he may no longer have need for 3 max contracts if players decide not to go to Miami. Unfortunately, unless Wallace is going to commit one way or another today or tomorrow, I don't see it happening.
As for Beasley, he's interesting. Getting him would mitigate the need to spend the MLE on a guy like Mike Miller as Beasley could fill the role of scorer off the bench. We'd then be free to spend the MLE on a big man or split it. Plus, while I wouldn't bet the house on him being a star, it's certainly still possible.