No games, but solid
Yes, many people (most computer users?) don't care about playing games on their PC. But the fact that most games do not run under Linux (I'm talking FPS or RPGs here, not Solitaire...) is a major reason why Linux is still a dual-boot option, at best, on many PCs. To say you don't care about that feature is fine, but you have to consider it when assessing the chances of Linux taking more of the desktop from Windows.
I've been using Windows since 1990, and tried several installs of Linux (most recently SuSe 10.0); the most recent install was simple, painless and fast. It had all the apps I needed (word processing, spreadsheets, graphics/imaging, email and internet access), and was 100% reliable. I'd even recommend a modern distro of Linux to any of my friends and family. They don't play games, so they could probably do anything they wanted to on a Linux system.
I would think the installed base of an OS would have an impact on its support by developers; if the Chinese government were to adopt Linux as a standard, that would have an impact on the installed base, don't you think?