As someone who watches every Colts snap: no.
He is perfectly rated as is. He’s a great back up QB and a bottom end of the league starting QB.
He has 0 arm strength and is guaranteed to throw 2-3 boneheaded throws per game that typically end in turnovers.
I shit talk Minshew because I can acknowledge he’s a cool dude and a great back up QB but he’s not starting QB material.