Muse is on your machine, and it won‘t die, only because Adobe stops its development.
Muse will continue working, if future operating system updates don‘t stop it.
Muse hasn't stopped working. It's just not being updated.
That said, it would probably be best to rebuild your Muse project with another web authoring tool as the code that Muse generates is not easy to work with.
Although muse is going to stop standing by itself,
Private support like Adobe Muse Expert will continue supporting muse users for FREE.
You can ask any muse related question and we will be more than happy to help you.