Mac vs. PC: Does it matter, since the browser is everything?
zdnet.com
zdnet.com
This may be true some day, but certainly not now. And even if it becomes true, "the browser" won't have more than a 50% role in the transition (remember how HTML was supposed to obviate the need for Microsoft Office formats?).
As long as people (in mostly businesses) cling to their legacy of crap that is dependent on Windows, it will be very hard for them to use anything else. It's never as simple as a few apps. It does seem likely though that in the long term more nimble businesses will overtake many of the ones who have their hands tied, and that ultimately a younger generation of workers will refuse to maintain old software anyway.
Some people just like certain hardware. Some people like games, whereas others need an OS with a real Unix base. The list of reasons to choose one, even now, is quite long.
The PC vs Mac argument really comes down to more of a Ford vs. Porsche (if you haven't driven a new Ford, check out the most recent Focus, I rented one and it is amazing what you get on an entry level car). They both run very well, have hardware that is suited to most tasks.
At this point it seems the hardware the average person buys is more about cache (that's with an accent).