A lot of vendors have been predicting that we are going to start having more virtual desktops, in the home, not just the office. All mom or dad would need is a monitor, keyboard, Internet connection, and a small box that never has to be upgraded. While in the backend you could be moved to different hardware in the middle of the day and not even know it. When this happens and people trust it, you pay 15$ a month for a "computer service," have a lower chance of failure, and improved features to make computing even easier for the general mass.
The personal computer would be a niche then. But, it is a niche now, isn't it? Tons of companies are using virtual desktops. (Not to mention that a "PC" at work isn't really a PC most of the time since you can't do whatever you want with it. Hence 'workstation' ?) How many more are using laptops? How many others only need to use their smartphone? iPad? Even just your TV?