Nils, you know a lot about the HT industry, but that's hamstrung your view of the videogame market. You're looking at the PS3 from the perspective of an A/V enthusiast, not a mass-market/casual gamer.
First, saying that I'd be wrong if anyone other than the truly hardcore gamers and technophiles buys the system is ridiculous. I'm making a generalization. Of course there will be those outside those groups who buy the system, but those are the two groups who the PS3 is mainly going to appeal to.
Second, you clearly weren't paying attention to some of the hype Sony, specifically Ken Katuragi, had been giving the PS3. It was supposed to be the gaming system to end all gaming systems. It is supposed to integrate every aspect of our lives. I beg you, sometime read some of Katuragi's statements on the power of the machine (and his pre-release PS2 statements) and try not to laugh at the hyperbole. The PS3 is going to be 10,000 (! - literally) times more powerful than the PS2. Yeah, right. The PS3 was supposed to have graphics that blew away the Xbox360. So far, it hasn't displayed any and graphics experts say it isn't ever likely to. The PS3 is supposed to have an online system that blows away Xbox Live. We're still waiting for those plans. Most of the reports out of E3 have declared Sony the definite "loser" of the expo based on the high price of the PS3, the Wii rip-off controller, the lackluster display of playable titles...it goes on and on.