Earlier quoted context omitted.
For consumers that can afford it, tablets may replace a lot of what a desktop computer does for those people, but there are many people who are lower income who will still depend on very inexpensive desktop computers, either ones the own individually or (more likely) ones that they can access at their local library. I think Ubuntu is heading in a direction where it will replace Windows for users that only need an off…
I think it's much more likely lower income people will use a smartphone as their primary computer than a desktop machine. Cell phones already have incredible penetration, and the cell companies (not to mention Google) are going to push smartphones into that population in short order.
I see a fair number of cheap desktop computers too but they're all running bootleg copies of Windows. People aren't paying for their software anyway so the price advantage of Linux is negated.