Well, we usually do have several games running at once. In my own opinion, now and then we have too few or too many games going at once, but usually we have the correct number, relative to people's abilities. I play every game, there are a couple other people who play every game. There's the one at a time crowd, and the pick and choose crowd... and so far it seems like every gets accommodated in the manner they want.
My game should be considered a regular game, MXI, for official purposes. I am going to begin MXI as soon as either MVIII or MIX finish (and it's my guess that they will both finish very soon). And then the only other currently running game is BMV (ZM1 will also end soon.)
I believe that either a RMM game, or even Volt's MXII, could begin when BMV concludes, probably during the early part of my game, which will at that point be the only game running.