Doubt it will ever happen. We saw this year what time off does a team in Detroit. Its not the first time thats happened.. im sure the MLB wants to avoid multiple teams having many days off between the end of the season and the beginning of the Divisional Series. Im sure TV also has something to do with that, they probably want those jampacked playoffs schedules ASAP aswell.
Also, depending how they plan to format it.. could be disaster for travel. 1-1-1 would be disastrous, ive heard people say in the past just play 3 games at one stadium, but that'd be a pretty rough disadvantage to one team. Neutral location perhaps? Only way I see it working out fairly. Of course in a situation like Atlanta/St.Louis many would argue STL prob didnt deserve a home game in a 3 game series anyways, but in future years whos to say the 2 wild card teams wont be much closer together in record?
I just think theres too many factors working against it for it to happen.