Highly unlikely. You'd only deprecate them if they serve the exact same purpose, but they don't. Many users will switch, but not those who want a posix runtime environment for a win32 executable that can run on machines that don't have WSL installed (cygwin, and the fork msys2 which git-bash is based on); or to use the gcc compilers to target win32 executables that use the windows native (non-posix) runtime - mingw. Do you know that you can use gcc to build windows executables and dlls from Linux, Mac, or WSL? That's mingw and it's not going away.

I have bash scripts within cygwin that control Windows firewall via netsh interface.

I still can't run those command under Windows Subsystem for Linux.

Wouldn't that be much easier to do with PowerShell? I haven't ever attempted, but I'm assuming...

I use mac, windows, linux, embedded linux all the time. bash/python are just native languages for me.

The powershell's syntax is just too esoteric for me. I did tried that a few times.