The era of the commodity beige box is coming to an end, and the days of the general purpose computer are almost over. Most people never needed or wanted a general purpose computer, and they're going to be happy with more limited devices optimised for a single, or a few, purposes. So long as those devices just work.
As a scientist I've benefited from being able to take mass produced PCs and be able to put them on desks very cheaply. The amount of compute power we've had access to as a result meant that money that would otherwise have been spent on expensive high end workstations could be spent elsewhere.
Those of us that need general purpose computing; designers, developers, scientists, are going to have to go out and buy increasingly expensive niche machines, effectively old-fashioned workstations. High end computing platforms that the general population just don't need on their desk or in their pocket.
Today people are all about the software and aren't watching the hardware hard enough. Today's mobile phone, the black rectangle with, at most, a single button is a transition device. Don't get too comfortable with it, and don't stop thinking about innovation. Because the black rectangle won't last as long as the beige box.