Removing or redesigning the Control Panel would break third-party apps that rely on the existing structure; Raymond Chen's blog[0] has mentioned apps doing this.
I don't believe in a sudden revolutionary change. Linux and macOS do increase their presence on the desktop, but the curve is almost flat, so it will take decades to even break even. Nevertheless, the trend exists, and Microsoft would have to do something very unusual to reverse it.
For me personally this is very important because the PC is one of the last open computing platforms.