It strikes me as rare that a wide received can have a large impact on an offense. It happens when you have a guy who is truly elite such that he has to be found before every snap and probably doubled, or lined up with your best guy on D. Most of them in top programs strike me as capable and very good but not elite. Some have good hands, run good route, have elite speed and cutting ability, and length, whatever, but few have the entire package.
A very good, but not elite, running back or quarter back might have a greater impact on the game than a very good but not elite WR.