There are only so many posts and questions you can ask before you need to make the leap. Don't let fear or constant references to forums block this opportunity.....you only have limited chances.
Don't wait for someone...anyone to say "You've made the perfect game. Release it tomorrow"
Believe it. Make it...and ride the wave afterwards.
**Disclaimer - I've had a few beers. But in any case...this is how I approach any new game design :)**