A list of well-known wide receivers who didn't top 1000 yards until their third year, or later:
Santana Moss
Steve Smith
Donald Driver
Terrell Owens
Derrick Mason
Of course there are the freaks who immediately produce, but if that's what you demand, then you are asking too much. Give our young WRs at least 1 more year before you are ready to kick them to the curb. Impatience is what drives our endless cycle of FA acquisitions, draft neglect, and ultimately our continued mediocrity. Chill out fools!