I'll say Linux will dominate the market at some point. Now, the only problem with it is that Linux, at many points, isn't exactly very user-friendly, per se, but OSes like Ubuntu, Linux Mint, and so forth are what will be there to take care of that. The only problem I have with Linux is that it does not support a lot of Windows apps, but WINE and other companies that are making the switch to Linux (Valve, for example) are changing all that, and very quickly. Anyways, if Windows and Macintosh don't get their act together and create more decent operating systems, then Linux will dominate the market. All Linux will need is time.