If you get rid of Carr, you’re doing with the purpose of moving ahead with looking towards the future. Jameis is not the future, so it’s a no from me.
If you sign a veteran QB, it needs to be someone that you could sign for cheap and potentially get lucky and strike gold on to build around, someone in the Justin Fields realm.
A “veteran,” but still young and with pedigree that may have not been tapped into properly.