Jazz should move Donovan, for sure, it just doesn't have to be this offseason. It could be next offseason. Jazz need to move him when there's a team that's anxious enough to do the deal we want. Let the urgency build.
When the Knicks are below .500 half way through the season and Leon Rose's job starts to become insecure, then they'll be motivated to close the deal. When the Brooklyn Nets are about to explode, they'll be motivated to reach for Donovan in a three-way trade. When the Kings are still outside the playoffs and their GM is on the hotseat, they might make a reach for Donovan.
Jazz will strike when the iron's hot enough. Ainge is really good at reading the market. Right now, everyone is going on vacation.