His numbers are steadily declining
The last 5,000-yard season Drew Brees had was in 2016. Since then, his yards per season has declined each year. In 2017, he threw for 4,334 yards; in 2018, he threw for 3,992 yards; and in 2019, he threw for 2,979 yards, although he did miss five games this past season.
He has also seen his 30-40 touchdown seasons turn into two 20 touchdown seasons twice in the last three seasons. His completions have gone down over the last four years as well as he is throwing fewer passes.
I know he has some stats that have gone up, the majority of his stats are in a steady decline. Because his stats are in decline is just another reason that the Saints need to move on after this next season.
Drew Brees has been a long-time icon for players, coaches, staff, the organization, and the city of New Orleans. No matter when he is gone, Brees will continue to be an icon. However, for the best for the franchise, they need to move on.