The data I have collected seems to point out desktops are not obsolete, at least not yet. The graph seems to vary, but at the end it is around the same place as it started.
Desktops are the most popular in states like Oregon and New York. It seems to decline in tech-heavy states, such as California. This means desktops are very useful to homes who just need a reliable computer
This picture shows the results for the number of searches for an apple macbook. As you can see, they are higher than the desktop searches
With this data, this is the conclusion: Summary Link