Millions of people still want to use "next, next" buttons. Let's assume 3 billion people using computers. Maybe all developers' count is 15 Mio.
The other people might don't want to understand technical things. Because of this, most people using an easily understandable operating system.
Although I don't like Windows, the Windows offers an operating system which even most stupid people can easily understand.
I'm using Linux since 2007. I was starting with Pardus. It was very complex for the newbies. I had a hard time installing Pardus but I could install Windows myself.
And comments are saying, the design isn't good. There are different window managers. Nothing has changed during all these years. This shouldn't be called stability.
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