I think it's important to remember PC<>AMIGA, never has been never will be.
Now the fact there are millions of combinations of all the necessary components to get a PC to power on is no excuse for the complete pile of bloatware crap that is Vista or Win7 no....requiring Ghz of CPU speed just to show a mouse pointer on a screen and double click on things to run them from icons IS A JOKE!
But it is also important to remember only Amiga made it possible, because when a disk boots on an Amiga it knows there will only be one type of chipset, or a very compatible subset of it. Also important to remember some of the functionality in the Kickstart ROM includes things that you need to copy onto even an MS-DOS floppy with the Format /S command. Command.com is required on all PC boot floppies in the 80s, but on the Amiga there is core OS code already there ready to run. Tandy tried this by putting Windows V2 onto a set of 1mb boot roms for one of their machines. Disaster though because Windows is too much of a work in progress to want on a boot ROM.
The Amiga was a console and a computer at the same time, it had the advantages of both. The 360 doesn't let you do anything beyond play games or movies, the PC has so many levels between the crappy Win7 code (let alone the game code) and the actual hardware that it's a real joke, but necessary due to how the PC has always been.
Can't really blame IBM, they designed the PC as a business machine, you CAN blame Microsoft for all their dirty tactics to get their crappy OS everywhere since Win95 though.
Taking Linux as an example, yes you can boot a Live CD distro sure, but it will be like running Windows games in 'Safe Mode' which if you have ever tried it doesn't even work usually, and even on 2D games runs about 20x slower if it does work. I am guessing people have forgotten the DOS days where you needed to run a different EXE depending on which brand of 3D card you brought

There are just too many combinations of components in a PC to ever allow it to become a replacement for consoles. And yes the fact Amiga died as a paradigm/ideal and Playstation began its meteoric rise to conquering the home market to the tune of nearly 300 million consoles sold by Sony alone so far in various generations you see why.
Just because the MSN/Facebook brigade buy PCs, many many people got fed up with dodgy PC OS and just went and bought a PS1/2/3 for fuss free gaming, before this time consoles were just geeky things or toys for little babies who wanted to play Mario in the 80s. The fact these 3D games machines generated graphics far in excess of a PC costing 3x as much was the final catalyst. The PC gaming market is now in serious trouble....and if it dies so does the Microsoft hold on the OS market. Hooray \o/
OS4 on PS3 would have given you back your dream situation...creative computer, beautiful OS, games that PCs can't compete with on price because its running on a close platform. Sadly Amiga Inc were a bunch of clueless twats and so the opportunity is gone forever. Ho-hum.
edit: There's no real commercial games market for Mac OS X but even so it is just Linux on expensive hardware for fanboys. Neither OS X or Windows is a real choice, it's like saying you can either be strangled or drowned to a victim die...what a choice NOT!