People might say you're overreacting but I agree. They probably have to trade Bradley anyway - although I'll be sad to see him go.
Team building is not a binary process, of course. Ainge has the benefit of not having to choose between sucking or leveraging the future. But our best players 28 and 31 and I bet you they will be stop being All-Star caliber players before LeBron and Kyrie. Suffice to say, I would not be opposed to trading Thomas and Horford.