Just for the sake of debate if the season ended today and you looked at the 12 teams that would make the playoffs.............. only 5 of the 12 teams have QBs taken in the Top 15 of the draft.
That doesn't mean you don't take a QB in the Top 15 if you can grab one and that player is high on your board. But it also means that drafting a QB with a Top 15 pick because you think that's the only way to get a QB (and you might even reach for one at your draft spot) might not also be the only solution.
I think part of the issue is that teams can reach like the Vikings did with Ponder and the Dolphins did with Tannehill. Although another part of the problem is that these QB's are starting right away in large part because they are top-15 picks. I think with the rookie pool, it's much more feasible to have a rookie QB sit a year or two and learn because it won't kill your cap as much.
I think if you look at the best QB's in the game, you have:
Brady (6th round)
Roethlisberger (11th overall)
Flacco (18th overall)
Dalton (2nd round)
Luck (1st overall)
Rivers (4th overall)
A. Smith (1st overall)
P. Manning (1st overall)
E. Manning (1st overall)
Romo (UDFA)
Stafford (1st overall)
Rodgers (24th overall)
Newton (1st overall)
Ryan (3rd overall)
Brees (33rd overall)
Wilson (3rd round)
Palmer (1st overall)
Out of those 17 QB's, 10 of them were drafted in the top-18 in the draft. Nearly half of them (8) were drafted in the top-10.
If we are to look at future QB's (undecided about how good they may become), we have:
Tannehill (8th overall)
Manziel (22nd overall)
Mariota (2nd overall)
Bortles (3rd overall)
Osweiler (57th overall)
Carr (36th overall)
Cousins (102nd overall)
Bridgewater (32nd overall)
Winston (1st overall)
We see a similar pattern....probably need to draft in the top-15. Carr shows the most potential of guys outside the top-15. Manziel more or less slipped because of off the field concerns. Osweiler has beaten the Patriots...and that's it. Bridgewater has been abysmal this year. And Kirk Cousins seems to be more or less an average system QB. The guys drafted in the top-15 are not any great shakes either. But, that only shows me that there's more to it than just drafting any QB in the top-15, even if he has the talent. You had better have a good supporting cast around him.
YR