As a single indie dev, I couldn't agree more. It can be a long road! Games (as opposed to say, utilities) are challenging because of the additional art/sound/creative requirements, IMO. And I think one important reason for why > 1 is better is that two founders can push each other along when times are uncertain (and they often are!)

That said, keeping momentum, coding away, and most of all greatly enjoying the process of creating something will really help you.