You have no way to post statistics about how many people are using *nix compared to Windows. Looking at search engine results only tells you how many people were curious to search for the term Linux. It does not tell how many people are running the operating system on their computers. Also, the trend of the number of downloads also does not tell an accurate story about the interest of *nix because some people are using it but not upgrading, some are downloading but then choose to download and use a different distro, and, some are downloading and then making copies to distribute to others so they do not need to download. That is the beauty of this operating system. Since there are, in general, no constraints about what you can do with it, there is also no way to accurately track it.
Also, many people use Linux without even knowing it. Android = Linux. XBox = Linux. Many consumer electronics, such as electronic organs and even microwave ovens = Linux. Most routers = Linux. How can you say it is dying? What has Windows running it besides desktops, a small amount of servers, and a few failed cell phones they tried to push on us?
Why is it that many countries are moving in a direction that forbids Windows from being run on any government owned computer? It is because the Linux kernel, as well as BSD, are open source and available for scrutiny, unlike Windows or OS X. Anyone can look over the code, decide what the do and do not like, and then create their own version that only has what they want inside of it.
My last point is that Linux and BSD will never die. My reasoning for this is that they are free, as in beer but also as in freedom, and many people will always want that. You will always have a large group of people who will use Windows because that is what they used at school and that is what their computer came with, not realizing that they paid a lot more for the computer because of the operating system. But, there will always be people who want a free operating system, or one that they can analyze to see what the code is, or one that allows almost infinite customization compared to Windows.