Casey, going by your proposal there will be (6+3+3+3=15) games on the first day(League Stage- each team plays every other team inside the group). Two games on the second day(Semis). Finals on the third day. But do you think they will be able to conduct fifteen 90min games on the first day?  In order to do that, they have to have at least four fields. Do you think they have four fields available in the vicinity?
    If they can conduct 15 games in a day, i think they will be able to conduct 6 games on the second day. So Quarter final ( 2 teams from each group) stage is possible too. Quarter finals in the morning and Semis in the evening. Just that the winning teams will have to play at least two games on the first and second day. And that's tiresome. The organizers have to devote a lot of time as well. Remember we tried to do that in dallas and they were playing until 2am in the morning. To rent four fields for the whole day, it's gonna take a lot of money as well.
   Your proposal of one team from each group is not bad either. So that the winning team plays only one game the next day. Let's see what happens. I haven't heard anything from anybody yet.
--Cowboy.