[bostik]

This has already been the case for political and/or social impact events for years in the UK's betting exchanges. The settlement rules for any potentially hairy real-world event have to be explicitly clear and account for all possible outcomes that might affect the resolution.

When there's money on the line, I have years of hard evidence that arm-chair lawyers (ie. betting exchange clients) will do absolutely anything to find potential loopholes in settlement rules and argue that their bets should have paid off.