Have you considered a slower moving league. I am guessing many new players may have some difficulty picking up the game and a slower schedule may allow the the opportunity to learn it and continue playing. Also good for those that don't have a lot of time.
I do plan to roll out different sim schedules, although I was thinking more in terms of quicker as opposed to slower - but that's probably not a bad idea. I don't want to go so slow that people lose interest, though. Maybe a M/Tu/Th/F type of schedule, so you have 2 games/week instead of 3?