Remember that the grass is always greener on the other side. In your situation this probably means that there's a new shiny idea that looks like low hanging fruit ripe for the taking. The thing is that, like every idea out there, once you get up close and look at the implementation, business model, etc. you will see all the ugliness that can't be spotted from afar.<p>If you've already launched something, or are close to it, then I would keep working on it. Ideas don't have much value in themselves. It's the implementation that counts.