We are spoiled
I moved to Denver just in time for Elway's last two seasons, and they've spent the last two decades since looking for the next coming, so I'm somewhat mentally prepared for what we have coming. Replacing Drew Brees, you're talking about one of the most durable, reliable and consistently productive players in league history, and the single most highly productive quarterback in league history. There will be a drop off, anyone thinking otherwise is fooling themselves, and it's not out of the question to expect that in the first three years after Brees retires we may see a half dozen different players start a game at quarterback for the Saints. It's just what happens.