You worry too much. Core supporters have been begging for large block proponents to stick with consensus. Surely, when that has changed those same people will stick with the new consensus. Anything else would be hypocrisy.
I do not worry. You haven't answered my question.
Consider a 50-50 split. Which one would you call Bitcoin?
In your hypothetical scenario you've already quoted how that works.
Yeah, but if Lauda don't get it, is it still a burn?
... Due to the oscillations in the hashrate, we would never have a perfect 50-50 split .
Edit: replace "Yeah, but if" with "Yeah, but when."