The return is a lot less in the final year. The reality is, no one on the Jays should be considered untouchable / untradeable. If some team is willing to deliver a haul for Bichette this offseason, you have to to listen and consider it.
If the Jays try to extend him this offseason, there is no interest from the other side, and the farm still seems relatively barren, the chance he gets dealt is not negligible.