In today's world of football, having a true number one receiver can be a game changer. Running backs aren't the primary weapon of a high powered offense; the quarterback-wide receiver tandem is.
Of course the running back is still a highly valued position for a team, but they can't do it all on their own. Take the Tennessee Titans for example, Chris Johnson was the best running back in the game in 2009 and still was among the top last season.
But why is it that he wasn't as successful last season as he was in 2009? He was the Titan's offense—him solely—and opposing defenses knew that coming into games. Their offensive scheme was easily predictable and thus being even easier to stop.
However, even if a team does in fact have a great receiver, without an equal or greater quarterback, their success may be limited. The wide-out has no problem getting open and making the play, but if a polished quarterback can't deliver the ball on time or in the right place, it can tend to frustrate the receiver.
That and the players surrounding him. If the other receivers, tight ends and even running backs aren't at the same level as the receiver, defenses are going to zero in on him because they know he's the only one that can do anything with the ball. That will only make matters worse for the wide-out.
There are many top of the notch receivers out there today who are just waiting for a trade so that they have the full opportunity to show off their full colors to the NFL world. Here they are: