I don't know anything about the future, but the future is accelerating, innovation happen unexpectedly (Egypt revolution, Google, Ipad ...). So let's expect some new agent to appear and dominate the market.
This is like sampling. You think than a few people paying implies a lot of people are going to pay for your application. So this is a statistical problem about inference, perhaps some model of customer is required to get better estimates for the confidence interval of success.