I agree with those who say we are having this convo because of the last 4 games.
However, I would not discount those last four games. First, they were all late-season games against teams that were still alive for the playoffs - two of which actually did make the playoffs. Second, as has been pointed out, he was in a new system, so you might expect him to be worse at the start - if he now understands the system, the last four games are potentially a truer test of where is at. Finally, the Saints fired OC Pete Carmichael; we'll probably never know for sure, but is it possible that Pete's role was minimized late in the season, especially if the Saints knew, and Pete could surmise, that he was a goner at season's end? IF that's true - admittedly a hypothesis - that bodes really well for Carr.