but I decided two players wasn't enough. I don't think I have the chops to keep a small crowd entertained. Pretty soon you are down to one person and then you are in a relationship. I have one of those, It is work. RPG's are a chance to sit at the counter and kibitz with the lunch crowd.
But it is better than that. After a couple of sessions you get to see who sits at the front of the class, They want to play and as a GM you lovingly set up the pieces because they are nothing but dreams until another puts their hands on the table.
No one is herding cats here. But the most success I have had with running a game online is with a firm theme, regular set times, and being at the virtual table as the host ready to go.
So when I cancel a session I am seriously conflicted. Even if one person shows up shouldn't I run the session?
I've always decided no because I think a table top RPG runs best with three players minimum. That is one GM and three players. So four. With three PC's gaming the GM has some of the session work lifted off their shoulders because the group of players are going to start creating and carrying adventure ideas. So as a GM I get to start playing more. Less script, more random tables, and more riffing off of cause and effect being driven by the players.
I've had some really good two player sessions. But for regular campaign play I see three players essential to carrying the story.