I just don't know how on earth a team could take on Wall's contract without being 1000% sure he is back to the old John Wall. The dude is owed over $171M through the next 4 years. I know that pre-injury Wall was a phenomenal player, but if he has lost any of his speed (likely with injury and age), then his game could go down hill quick. When the new season begins, he will have not played an NBA game for over two years.
I get that Beal is the real prize here and that Horford's contract is certainly iffy, as well, but Wall needs to prove himself on the court before another team will take him on imo.