The reality is that great game ideas are a dime a dozen.
People are creative creatures, and anyone can come up with a promising idea for a game.
Just gather a random selection of people into a room, place an energetic discussion leader in front of them, and within an hour you will have a white board full of ideas that can develop into hit games. What makes a game concept valuable is not so much the idea itself, but people and planning behind the idea. The best games are the ones in which your entire development team shares an enduring enthusiasm or obsession, enabling your team to maintain its creative energy throughout the development period, typically one to two years. Moreover, the enthusiasm must be infectious. If the publisher's development, sales and marketing departments do not catch your enthusiasm for the game, their initial interest will soon be diverted to other games in development.