I mean the fact that a fork of FirefoxOS KaiOS is still around and being used shows that there was some merit to the idea but yeah it was executed as a start-up without a long-term plan but thanks to the open nature of the code its still in use.

It would be great if Mozilla as an organization tool the opposite approach of Google and if they started a project you knew it would be supported for the long run and if not internally it was handed over to the community of users and stewarded along, sort of how Apache seems to adopt projects but mostly for corporate/enterprise users.