Lets say you keep Carr and most of the roster intact for the next two years. What is the realistic best case for the team? Maybe we win the South? Maybe sneak out a playoff victory? The ceiling for this team is just not that high. Let's say we do win the South in 25-26, what then? Do we resign Carr. By 27 we are likely moving on or have moved on from Mathieu, Davis, Hill and Kamara. Not sure I see the upside of keeping this core together for a small chance at winning the division.
Carr is a fine QB, I think in the right support system with the right talent he could be a good QB, but I don't think he is the future for the Saints. By moving on from Carr now, it forces the team to start thinking about the long term future at QB. Give Rattler a year to see if he can develop and then if he does not got get the QB that Moore wants to build around.
Underhill made a good point about the Steelers on a pod the other day, about how they have a great organization that always has a winning record but have been unable to make any real SB run. Yeah it's nice when when you keep making the playoffs but even that can get stagnate after some time. Caught in this loop of always being good enough to win 9-12 games a year but never good enough to win it all.
I don't want want the Saints to get into this stagnate loop of mediocrity. Sometimes you just have to pull the band aid off.