I'd like to continue to see the 2nd MSRC attempt to keep fragile systems in place, such as the Attican Colonies, the Krogan Rebellions, and other tensions growing in the galaxy.
I'd like to see the 2nd MSRC continue along it's current path but eventually hit a climax that will launch the server into a new, massive conflict that will test everyone's ability. (Comparable to the build up of ME 1-3. We did this /very/ well the first time.)