Ideas are not worth very much, and many try to focus on world-changing ideas, which is the wrong approach. I sit on two or three profitable ideas at any time, there's just not enough hours in a day to dedicate serious effort to any.
What would you say is the most important then? The right people, or sticking with something for long enough?
So effectively the problem most people have (including me) is finding an idea you will keep believing in even after the hype and excitement has faded down, and the only thing standing in front of you is the mountain you still have to climb.