I can't see it happening ever IMO. If it did, then the organisers would just have some type of WTF arrangement and invite the top 24 players to contest it.
Do you honestly believe, the top tier players would give up the chance of racking up 2,000 ranking points and $2m prize money? Not a chance in hell they wouldn't.
Hell, they should just skip all the early rounds and just play the SFs with Fed/Djok/Rafa/Muzz
The sponsors would love that.