That's actually a philosophy that I've taken up in the once in a blue moon event that I actually decide to full on GM a game. I'll wait a few days to see who replies, and if somebody doesn't, then we'll just move on. If they come back, I'll try my hardest to catch them up and get them back  up to speed (this would be INCREDIBLY easy in this RP, where every character is just sorta doing their own thing).