That's partly what makes it so amazing that we Patriots fans have been able to cheer for the greatest QB of all time for the last 20 years. Whenever Brady does leave New England (via FA or retirement), it's gonna be a definite and significant step down—and for at least a couple of years, likely longer.
Yep, it's been such a privilege on so many levels to get to root for Brady for basically two decades.
The especially hard thing about finding a franchise QB is it's not like it's as simple as tanking for a top draft pick.
Some of the best guys in the league were taken in the 1st round (e.g. Jackson, Rodgers, Mahomes, Watson), but then you also have guys like Brady (famously late pick), Wilson (3rd rounder), Jimmy G (2nd rounder), and Brees (2nd rounder).
None of those guys was #1 overall pick. Also each year it seems like 3-4 QBs are taken in the top 15-20 and at best maybe 1 of them turns into a clear cut long term answer at the position.
It seems like the Pats are probably going to have to look for the next guy in the 1st round or early 2nd, but they might have to draft a few guys before they find one that pans out.
Oh well, that's just how it goes. We'll have the warm memories of the dynasty to keep us comfortable during a hopefully short time spent in the wilderness.