personally I wouldn't want 2 megas in a year, I think it has a number of drawbacks trying to have 2 events in one year, maybe there should be a timeframe where regions should announce in the main forum their intent to hold a mega, then it should be discussed in here
one of the main problems is that with two megas a year you have competition for funds going on between 2 rival factions at the same time, I think a mega requires the 2 years to plan and establish their aims