Yes, Adobe released the final feature improvement for Adobe Muse on March 26, 2018. They will continue to offer technical support to all active Creative Cloud customers until May 20, 2020. No new features will be added to the program beyond critical operating system updates.
With this news we have decided to stop support for our widgets and templates as well. Video tutorials are still available on YouTube that go over how to use most widgets and a few of the templates.