Refocusing on making Mozilla a viable entity without the need for cash splashes from Google is doing precisely the opposite. By diluting Google's financial control it ensures decision-making is both actually and ostensibly impartial.
Gecko is still a perfectly functioning browser engine. It's far easier to keep Gecko up to date with modern web standards than reinventing the wheel.
As nice as it would be to have a free and open source browser engine written in a memory safe language, I can't see there being a lot of money in it for Mozilla.