Why exclude FF? It’s good.

Currently. Though Mozilla is giving no clear plans on continuing the projects importance. If anything it seems Mozilla is planning for an eventual sunset. Hoping to have revenue alternatives for when Firefox is irrelevant and they stop supporting it.

Firing a team building a meaningful advancement in Firefox's tech stack is a big signal, imo.

Is it possible that if Mozilla folded or stopped supporting Firefox that the open-source community would continue to support it?

Possible, but not to a sufficient extent to keep up with the ever changing needs.

Yeah that was devastating this week but maybe it can somehow reverse itself, I don’t know.

Why would we want a continuation of what isn’t working.

Let it die, rebuild from the ruins.

It's pretty good, albeit much less good since the old XPCOM extension support went away. (My position is that XPCOM compatibility could have been maintained in a multi-process world through better dynamic object proxying.) But as Mozilla's money dries up, so will Gecko, Servo, and a bunch of other fascinating projects. It's sad. But the web won't stop evolving, so we're going to end up a webkit-only world.