What does protocol require at this point? is the game dead or can the rest of you go on while Myth catches up later or could you start another game in its place?
There are several possibilities that I've seen before. This is Myth's game and he may choose to continue it later. I'd give him more time before declaring it dead, unless he says so.
Most SG's have at least one strong leader/player. It will usually be the person who starts the game...a good example would be TheOverseer714 who, although a fairly new player at first, has held together his SGFN series through 4 games so far.
It could also be a single strong teacher/player who is willing to take charge and keep the game moving by skipping slow players, adding new players if an old one drops out, and generally keeping a game on track. Bede is an excellent example of a strong leader/teacher, but I've never seen him do a training game below Emperor.
A third possibility, which usually works well only with all fairly strong, experienced players, is to just carry on without a leader, but it takes a committment from all the team members to show up, participate in discussions and play their turns on a timely basis.
Another way is to start an "open" game, where one person sets up a game with no actual team members and invites any interested player to pick up a turnset whenever they have the time or the interest. I believe Daghdah did one as a space shot just before Christmas that was going pretty well, but I don't think it ever completed or had a lift-off.
I suppose there could be many other variations on the above, but most often you need somebody to be in charge and keep things organized.