I wouldn’t touch his contract with a 10 foot pole but I don’t think turning a team into a contender is a prerequisite. A team like Phoenix has tons of cap space, a glaring need for a PG, and is motivated to get better quickly. They could accommodate Wall’s contract if they include Anderson as part of the deal. Ayton won’t be due for a big deal until the last year of Wall’s contract. Adding Wall to the team this year won’t impact their Zion chase much either. Add Wall to a team with Booker, Ayton, Warren, Jackson, and a 2019 lotto pick and you have the makings of a pretty good team on paper.
Another team I can think of is New Orleans with a Wall/Holiday swap. How strong is the Kentucky bond between AD and Wall? You’d have the shittiest team around those two if you had both but, who knows, maybe they get wonky for a few years in their desperation to keep AD.