It wouldn't surprise me if we see rules come in at the end of the year that penalises people for running back with the flight towards marking contests.
This used to be the most celebrated act of bravery to put yourself in harms way to contest the footy, I think this attitude has to change.
A player leading up to the ball has good field of visison and is coming up towards the ball, and if a player is coming hard in the opposite direction they instinctually brace for impact, as evolution has hard wired into us.
Compare that to a player that is often sprinting into oncoming traffic with eyes only on the footy. Not only are they putting themeself in danger, they are showing no care for whoever they might run into.
They are essentially driving a vehicle at high speed while blindfolded. Is this not reckless?
Of course there are nuances with every contest and varying speeds and intent on genuine marking vs deliberate attempt to bump.