Linux is already a multi-billion dollar success, regardless of whether or not Joe Arsewit uses it on his netbook.
"It has to pop up, grow, spread, take over and become the primary whatever it is."
Why? Are you saying that monoculture in Desktop OS's is actually a desirable thing?
We've seen where that path leads - to increasingly sophisticated attacks that are massively successful because they can exploit weaknesses found on so many identical machines. I'd love for more people to use linux on their machines, but I'm not foolish enough to be shouting about linux being the only OS. That's what got us into MS style trouble in the first place.
"Otherwise, well, it's just a pain in the ass."
Then I am gladly a pain in the arse or a thorn in the side of you and your ilk, and will continue to be so!
I'm surprised about the printer. My experience with printers in Linux has been better than n windows. On vista I had to download and install over 100 MB of stuff (I'm really not kidding, though I later found out there's a 38MB version if you follow the "business" link) to get my HP network printer up and running. On Ubuntu I just hit "scan" and it found and configured it.
As for napster and tunebite - sorry, but you want to subscribe to a DRM'd music hire service like napster and then rip the results.... Isn't that somewhat immoral? And probably illegal? Avoid DRM and crap like napster in the first place matey. Or try it on wine...
Your games console will be able to interact fine, if you find a upnp serving program like mediatomb, geexbox, ushare or others. Available from repositories in ubuntu.
Personally, I find linux easier to set up and more functional than windows, for my needs. But I realise it doesn't work that way for everyone, and I don't tend to buy cheap-ass devices that can only be used with a PC speaking a proprietary protocol from windows-only software.