I can't possibly agree with this more. I think that there are still guys out there who can lock half of the field down. Champ Bailey, Shawn Springs, and DeAngelo Hall come immediately to mind. I don't necessarily think that its fair to compare most CB's to Deion simply because he was an exceedingly rare talent (even if he is as aggravating as sand in your bathing suit).
With that said, I think that the Beerlover's statement that "defensive coordinators are finding better ways to integrate them into the defense to take advantage of their playmaking skills rather than leaving them isolated in man to man coverage on an island" is very true. In a lot of systems you simply do not have to be "shutdown" good to have a solid career as a CB.
LT's... well, I think that over the past 20 years you've seen pass rushers get bigger, stronger, and faster. Men who are smart enough, fast enough, strong enough, and nimble enough to keep up seem to be getting harder to come by. Now, there are some great LT's out there now and there are some LT's out there who seem to be ready, to borrow threetoedpete's terminology, to accept the baton.
I guess what I'm driving at is this - the perceived lack of stud LT's is less a result of lack of talent or less talent available than it is a reflection of how much more difficult it is to defend against a pissed-off Julius Peppers.
Make sense?