Even if someone is purely a disruptor with no attempt to catch the ball, how is that different from being a dummy runner? They are both legitimate tactics to confuse the opposition and should be treated the same - no contact, no penalty. Tie this in with the increase in short dropouts and, unless you have a high likelihood of catching the ball it may be better to not even compete for it. So what's the point of the short dropout if there's a disincentive to compete for the ball?
It's another solution to a problem that didn't exist.