I would love this change, and it's been long overdue. If you truly have your man beat deep, and the pass is accurate, there is nothing a DB can do to stop it.
Over the past 20 years it's devolved into: Gain 1 foot of separation, crappy QB underthrows pass, WR acts like he's been raped, flag, 50+ yds of offense, outcome of game is changed. That's not football.