We are never going to see this rule change. And I believe that the refs saw that play as incidental contact, which is why there was no flag. The rule change needed is that looking back for the ball should not absolve either player from egregious contact before the ball arrives. The replay clearly showed that Schoonmaker was going to the ground before teh ball arrived. At the same time. Blankenship was on the back of his legs. This has to be interference whether Blankenship was looking for the ball or not. The receiver has a right to the path to the ball. So does the defender but he can;t go through the receiver to get to the ball.
Someone on Twitter brought up an interesting point. The receiver has to demonstrate control of the ball through the process of going to the ground but on this play he is ruled down before he finished the process of going to the ground. There is a bit of a contradiction in these rules. For example, If Schoonmaker dropped the ball when he hit the ground, it would be ruled incomplete even though he was already ruled down when his knee hit.