Since the Patriots drafted Tom Brady, they have drafted 9 other QB. 4 of those are still in the league. 4 of them were subsequently traded by the Pats for future draft capital.
Since 2012, the Eagles have drafted three QB. All three are still in the league. Two of them were traded for future draft capital. Amazingly, they got one back for free, and he was potential draft capital again.
And the success of the other 30 teams?