Well, I am pretty sure that it won't kill them which is part of why I got into Canon after m43. But the too big to fail bit didn't help many other companies before.
Cameras are certainly a specific beast, as the mount system naturally breeds hard commitment to the brand and mount due to investments into lenses.
1. Lower DR at levels that most normal users don't exploit don't matter, but spending $200-500 more is something immediately clear to any consumer.
2. Canon lost a lot of new users that didn't want a DSLR, but was able toto maintain market share thanks to system lethargy, brand loyals, and market name and obviously the fact that the cameras were good regardless. Regardless they immediately countered the APSC E mount within one year with the EF-M mount which at lower costs is much more fluctuating. The FF market with the big investments and initial cost barriers, allowed them to wait longer with RF mount.
Given that Canon cameras aren't better than other brands' and that the system is also more expensive, I will assume that brand recognition and loyalty are the main reasons for Canon having kept market shares stable.
It doesn't change the fact that I don't see any interest in the brand in my circles, not that Panasonic or Nikon fare better in that regard. Sony seems to be gathering more interest though.
Let's see what happens in 10 years, I doubt either of us will have moved on from here.
PS: Please keep ridicule to yourself. Such antics just diminish your other arguments.