I don't get this dark/pessimistic/Firefox's so done view many people love to harp. Do we want Firefox to return, or to die? We should decide and act accordingly.

Telling Firefox to not to move and get out of the place where it currently is a great contradiction in itself.

Many potential Chrome users were not users, and now they are. You can change public opinion by putting your money where your mouth is, and being persistent about it.

Also, let's not forget that Firefox is kinda preventing itself being detected via standard mechanisms so global analytics show its numbers a bit low than the reality, as well.

Many potential Chrome users were not users, and then android happened. I'll believe firefox has a shot to become mainstream when they do something similar. Until them, keep your users or alienate them and disappear.