QB question - Keenum or stream other QB?

I’m in the Championship game and I have Keenum starting. I could pick up someone like Foles (depending on if he plays) or even Tyrod. Other QB’s available are really not worth mentioning. Am I overreacting and questioning leaving Keenum, or should I make the change to another QB for the last game?

appreciate the help. good luck to everyone still in