Quite the opposite. The death of Mozilla Corp will drive the community to greater heights. I expect to see Floorp, Librefox, and even Basilisk/Pale Moon having a voice in the conversation of post-MozCo Firefox.
I switched to it some time ago. Took a while to find all the dials to turn to get some (trusted) sites to work, but the fact that it’s free of telemetry and has Ublock makes it worth it.
Chrome funding would shift, not necessarily stop. And having a dirty source of funds as your primary source is fundamental corruption. Even if works now, the future is bleak.