The personal computer explosion is so heavily associate with intel-Microsoft that it is difficult to imagine Microsoft not being around for a very long time.
What value, though, did Microsoft add to the computer revolution? Perhaps it can be measured by the market value, but I don’t see it that way.
Windows is not really that great of a product. A better alternative existed long before DOS & Windows: Unix (Linux, Ubuntu) is the “Beta” to Microsoft’s “VHS”. Unix doesn’t bring the problems of viruses, malware, and instability because it was properly designed from the beginning.
Mobile and other devices, and of course the internet, are further eroding the prominence of Windows and other Microsoft products.
Windows will either evolve to Unix-type operating system or Microsoft will erode to a footnote.
The really interesting question is, what can be learned from this?