I am a gamer, yes, and existing mobile devices are a decade behind existing platforms for high-end gaming. That’s not to say they won’t catch up faster than it took those platforms to get where they are now, but gaming on a tablet or smartphone is no where near as effective, efficient or fun as playing on a large-format TV with surround sound.
I’m a realist. I understand that the market wants people on smaller mobile devices. However, there will always be a need for static, stable platforms until the market can develop a large-format platform capable of interfacing with those mobile devices while utilizing processing power better than what can be provided by that mobile device. Virtualization technologies are certain to lead that charge, but there’s little to suggest a market emerging in the next 5-10 years that will satisfy the high-end graphics and processing requirements of the newer breed of interactive games.
In general I agree with you, but that's actually a little bit of a chicken and egg paradox. I remember when Doom was a high-end game. If people keep making better games that demand better hardware, you'll be right. But if the games makers decide there's more money in finger fun for phones, (phinger phun phor phones?) then there will be little demand for better desktops, and the effort to develop them will fade.