Brady's first losing season was in Y23.
They are gonna need to retool but there's reason enough to believe Mahomes peaked early and the domination is gone. As mentioned, his individual performance has trended down for three consecutive seasons now. When Brady hurt his knee he was coming off an All-Time season, Mahomes is years removed from his All-Time years at this point.
I don't think any of us wish injury on him but the path forward for him is learning to be a pure pocket passer, and Veach and Andy completely rebuilding the roster around that.