The biggest issue I see with starting an IC with an MME is that it does open up the dreaded 'Robinson Park' scenario. Especially since we'll likely have an influx of new players to expand the roster or replace some of those we've lost along the way. An easy way to establish oneself is to contribute to an MME and a lot of roleplayers do desire interaction over the more sandbox approach. 

For that reason, an MME as a kickoff in the IC could lead to overcrowding which would bottleneck progress potentially. 

Or it could go really well and start things in a really exciting manner. 

I think though if we were to have an MME at the start of the next IC, I'd prefer it about 50 posts in or so.