If you like gaming, all of the major platforms have their own exclusive titles. Plus, you don't have to upgrade your hardware every year, it's more like every 5 years that you get a new console.
Some games that are successful on the consoles just wouldn't work without a controller, and some games that are successful on a PC/Mac just wouldn't work without a keyboard or mouse. Both consoles and computers have their advantages and their drawbacks, it's too easy to dismiss one or the other out of hand.
Thankfully, I have a good HDTV for gaming and can get the full experience out of a 'next-gen' console. I'm not sure if I would have been nearly as quick to make the leap to get the Xbox 360 without the TV. I have heard (but still have not yet seen) that the 360 graphics are pretty much on par with the original Xbox when using a standard TV.
The MMORPG I've been playing for the last 3+ years, Shadowbane, was a PC/Mac Hybrid. It just wouldn't work on a console. It's really the only computer game that I've wanted to keep playing for any length of time, the others kind of sit there and aren't played. Unfortunately, Wolfpack Studios, the developer of the game, is being closed by UBI Soft on May 15th as they are becoming console exclusive (no PC or Mac titles at all). So who knows what the story with Shadowbane will be after May 15th.
I don't think Apple will throw their hat into the console ring, it just doesn't make a lot of sense. Consoles require a good amount of first party titles (meaning Apple would have to develop games). Take a look at what happened in the last generation of consoles with once successful Sega. They put everything they had into the Dreamcast and despite the PS2 launching with horrible titles and very few systems, it was enough to drive Sega under. Sega's games were better, they had an online service years before the PS2, and initially, their system had better graphics. But it couldn't play DVDs or old PS1 games and that's what ultimately killed it. Yes, Sega didn't have the warchest that other console makers like Nintendo, Microsoft, or Sony had, but it's a really cutthroat business. Microsoft has lost money on the Xbox, Sony is going to have to take a bit loss, at least initially on the PS3, and Nintendo makes most of their money off of handhelds. Do you think Apple could really compete in that kind of market, and why would they want to?