There are maybe 3 teams in the league who would entertain that salary for Wall.
Rozier, Robin Lopez to WASH
Wall to CHI
CHI 2020 1st rounder to BOS
I wouldn't touch Wall with a 10-foot pole, but the corpse of Lopez and a future 1st is a pretty cheap price for a team that can afford his salary (big market, $50M+ cap room this summer, Carter & Markannen & LaVine under contract for 3 more years).
Washington gets a look at Rozier and the huge salary dump.
Boston gets another 1st rounder asset.