What you did was go upmarket. But you have to realize what the biggest problem with going upmarket is: you lose sight of the significance of where you started. They say it's loneliest at the top, but it gets pretty sparsely populated as you go up, too. The further the market panders to increasingly refined tastes, the worse the market diaspora gets as people leave the market.
That, mainly, was the point I was illustrating by example. That the more the market focuses on refining the values that customers demand more of, the more customers they risk losing (and will lose). That takes many forms, including the example of players getting "over-bored" I gave earlier: users coming to the epiphany that the games aren't fun any more because they're getting better in directions that no longer matter to the player.
I'm not saying that'll happen to you any time soon; it sounds like you're pretty firmly on the train of the "next generation" market that focuses on the core demographic. But you're going to find it's a much lonelier journey as the years go by...
Sky Render - Sanity is for the weak.
