To me, he's in an odd spot at the moment. He's on pace to be a 2-3 WAR 1B, which should put him among the Top 10 1Bs in the major leagues, but it's unclear if he will take a Rizzo-like jump in production, or if this is the level we can expect from him going forward.
I think it's going to come down to internal evaluations in the offseason, because, facially, he is an excellent piece in a hypothetical trade for someone like Vlad Jr. At the same time, last offseason, he would have been an excellent piece in a hypothetical Pete Alonso trade, and now Busch is on pace to have a substantially better season.