it already happened
as of this patch 9 the main character should be auto selected at the end of combat or when a talk happens... the small issue is that change they made doesn't work
Ah! I did feel that my main PC was being talked to more often, even when another party member was closer, but thought I might be imagining it. I didn’t spot in the release notes or elsewhere that there had been an intentional change … I suppose there were a lot of notes.
But yes, if this change has been made it’s certainly not working all the time.