That's the kind of thing that would need to be automated imo... It's just not practical for me to try to manually create a ton of 8 person tournaments. It's also something that could be handled by an individual if they're passionate about it.
Make a proposal and ask for some seed funding for the prize pool with a gameplan to recoup and burn the DEC. My strong suggestion would be to ask for Rebellion packs with a gameplan to burn 4,000 DEC per pack the DAO allocates to this idea.
It would most certainly have to be automated and the script would be super simple:
New Tourney Category: Sit 'n' Go
Check: Is Open Tourney Avail Yes/No?
If Yes, wait
If No, then create Tourney with 8 Avail Slots
This would allow players to buy in and play with the top 50% taking home the prizes. Or winner take all :D