It can't and it won't because of the logistical nightmare that is travelling during the postseason. If LA and New York are in the World Series, are they just gonna play night games, travel across the country next day and play on the same day? It'll never be approved. This season's scenario, which I think is awesome don't get me wrong, is only possible because every game is played at the same venue, and that's obviously not sticking around post pandemic since the league and teams want home field advantage to mean something.