On the other hand - what's preventing you from GAMING on your PC?
Exclusives.
The console exists to play the games. Not every game is available on every console and the technology of the console also drives features and quality in the games.
So if you want to play a game that requires a certain console, yes, you are forced to buy that console. Likewise, if you want to play a game with your friends on a certain gaming network (PSN, XBL, Steam, etc) you are also forced to buy a certain console.
And a console used to exist to play games. Clearly, the market is moving away from this. Just because that's what it used to do doesn't mean that what it's moving towards doing. Technology is ever-changing and hanging on to outdated beliefs will only result in disappointment.
In my family's neighborhood, if you are a certain age and want to play with the other boys for many hours out of the day, you must have an Xbox Live, Minecraft, and Modern Warfare 3. In an odd way it does, in fact, involve them putting guns to each others' heads.
The OP said "I want a GAMING console."
> a console used to exist to play games. Clearly, the market is moving away from this.
And the OP gets to express his disappointment in the direction of the market. It doesn't make him wrong.
Personally, I think it's a mistake to simplify the market like that.
Yes, our family uses our Xbox 360 to watch many hours of Netflix. But that's just because it happens to be plugged in to the shared TV. The Playstation or any number of other devices in our house (even weensy little tablet CPUs) can also play Netflix just fine. If we played PS3 games more, we'd go back to watching Netflix and DVDs there.
It's not because we "want our Xbox to be a more general entertainment device", it's simply a technically incidental task that's barely worth plugging in an additional device for.
Many consoles can play DVDs as well as games, but should DVD playback drive the evolution of consoles?