I would probably trade any QB besides Rodgers or Cam for him in a dynasty. You can always find a QB. Perennial 1000 yard receivers have a higher price tag.
You can always find a QB who is good for 4732 yards a year? That's Brees' average since he joined New Orleans. Guys like that don't grow on trees. Blackmon's career might be twice as long as Brees', but his bust risk is twice as high.I get trading Brady for Blackmon. I don't get trading Brees for Blackmon. There's a huge difference between 32 and 34- it's the same as the difference between 26 and 28 at RB. In the meantime, Drew Brees is the kind of guy who wins you leagues. Since joining New Orleans, Brees has finished 9th, 22nd, 3rd, 7th, 27th, and 2nd in overall season-ending VBD. His VBD value has been topped by 1, 8, 0, 1, 6, and 0 WRs in those seasons (average of fewer than 3 a year). If Brees gives me just 3-4 more years of that kind of production, I won't care in the slightest what I had to pass on to get him- I'd much rather worry about how I'm going to replace him in a couple of years while I'm busy counting my rings. Perhaps I'll replace him by trading another 1st round pick for a 32 year old proven difference maker. Ya dig?
Brees has a more compelling case because he's younger than Brady and has been a more consistent difference-maker in FF leagues. Here are their PPG averages for the last several years in one of my PPR dynasty leagues:
Tom Brady
2011 - 27.17
2010 - 21.53
2009 - 20.74
2008 - N/A (injured all season)
2007 - 28.42
2006 - 17.21
2005 - 19.42
Drew Brees
2011 - 28.91
2010 - 21.49
2009 - 24.07
2008 - 23.48
2007 - 20.63
2006 - 20.19
2005 - 16.98
Brady has had several great seasons and two insane seasons, the Moss year and this year. He was absolutely a difference maker in 2007 and 2011, but not so much in 2009 and 2010. If you assume that his "real" expected production is somewhere in the middle, then you're looking at something like 23-24 ppg, which would give you a nice ppg edge over merely "solid" QBs like Romo, Rivers, and Ryan. Then again, that's not a safe assumption and Brady will be 35 next season. Will he age like Warner or will he age like McNabb? There's no way of knowing.
Brees has averaged 23+ ppg three of the last four years. The Saints have been more consistent in their commitment to an all-out passing attack, as Brees has ranked in the top 2 in pass attempts/game three out of the last four seasons. He actually ranks first all time among all NFL players in career passing attempts/game average. In other words, he plays in a very friendly system. That's not likely to change given how successful NO has been recently. I think he's more likely than Brady to average 24+ ppg next season. At the same time, buying him now is clearly buying him at the peak of his career. He absolutely shattered his career bests in passing TDs and passing yards. Even with Sproles and Graham looking like key difference makers, I'm not sure we can expect another season like this.
The age thing is also a factor for Brees. 33 isn't ancient for QBs, but it's not young either. Brees already ranks 11th among NFL QBs in career pass attempts, so you could argue that he's an "old" 32 (he also has a serious shoulder injury in his past). On the other hand, he's barely over 50% of the way to Brett Favre's NFL record of 10,000+ pass attempts, so we have a precedent of a player with a similar stature and playing style enduring for many, many more years at a high level. Brees might be capable of 6-7 seasons of near peak performance.
I still think I'd take Blackmon and Richardson. I think it's relatively easy to acquire a serviceable starter at QB. Sure, you might not get 4500 passing yards or 35 TDs from a player like Eli Manning or Philip Rivers, but in any given season they have the potential to be right there in that 21-22 ppg range, which is right where Brady and Brees were last season. And how much would it cost to acquire one of them? A 4th-6th round pick in a dynasty startup? Whatever it is, it would be much less than the price of a solid, dependable starter at RB or WR.
Therein lies one of the problems with paying top dollar for a QB. Rightly or wrongly, QBs aren't valued as highly in FF leagues as other positions. So if you draft a QB with a premium pick, right away you've limited your flexibility in trades. You likely won't be able to move Brees or Brady for a top RB/WR. On the flipside, there is almost always a market for a top WR/RB (though you'll encounter similar problems if it's a 28+ year old WR/RB).
And the exit value definitely favors the younger guys. Brady and Brees might give you great production over the next five years, but their trade value will depreciate steadily as they approach their expiration date. Players like Blackmon and Richardson will actually appreciate in value over the next 2-3 years, provided that they live up to expectations.
I can see the sense in both sides, but I think the career year syndrome has inflated perception of Brady and Brees's value, and I just happen to think that the best players in this year's draft qualify as those rare can't-miss talents who you can realistically expect to become among the most productive and valuable players at their position in the NFL.