@kona:
You can define a Windows emulator as something like VMware or Vbox if you really want, but you would be incorrect to do so.
Neither VMware nor Vbox are operating system emulators. They're virtual machines. You'd be better off defining them by what they do - emulate hardware. They don't emulate Windows. You can attempt to install Windows or, I suppose, most other operating systems that support x86 architecture. Here's a nice table outlining this for VirtualBox:
A nice table outlining that
Next...Not sure why it's important that WINE not be installed by default. Please let me know if there even exists the concept of standards or default in the Linux world (I'm only half-joking). It sounds like a pendantic argument since you can install WINE through the package repos of any distro I can think of. Right?
The only reason some flavor of Linux isn't my primary OS is because OpenSolaris is better in few ways, both technical and in a practical sense. And the only reason I don't run OpenSolaris as my primary OS is because Vista is about one million times better in supporting the hardware set of my convertible tablet PC. But the laptop isn't my primary computer either. So why don't I run Vista, Mac OSX, some flavor of *nix or BSD or Solaris on my desktop? Because they all suck for supporting games and pretty much anything that runs through the Microsoft APIs (e.g., DirectX). Maybe one day it'll all come together. But there is a reason you're in that 1% of all users that run Linux as a primary OS.
The good news is that if it weren't for WINE (or similar projects such as Qemu) - which for some reason I now feel the need to underscore the fact is not part of Linux - you probably wouldn't even have that 1% of the client PC market. I suppose it is better represented on the server side, but then again that's almost a no-brainer when you consider server costs. Hard to argue the benefits on the server side when you can put up a LAMP server for the cost of just the hardware. Sounds like a deal to me.
Anyway, Linux is cool. It offers a lot for its price. It's not magic sauce. It needs a lot of work. It is buggy. It is not user-friendly. It lacks direction and standardization. It is usually improving. Sometimes it is not improving.
It has a place in the client PC market. Currently, a vanishingly small place.
When it can run my games better than my XP desktop, I will consider making it a permanent resident on one of my partitions. At the moment, 3 of my 4 spindles are devoted to non-MS operating systems. But aside from the XP partitions, none remain for very long as I'm constantly trying new operating systems on for size.