If you would know a bit better the history of bitcoin, you would know that such forks are pretty much impossible to be done because of politics. If this would be done, it would end up in a split, where the actual miners will still remain on one of the chains.
So, as we keep saying to people coming with... ideas... "make your own fork and see how many will use it".

( Date Registered: June 09, 2011 )
You do realize that if the keys are broken, it doesn't matter _how_ much you mine... when addresses are compromised via quantum computers, theft of coins seem feasible.
So you'd have to question any coins transmitted on the
broken network post-fork

ECC was around for a decade before bitcoin came on swinging. I'd be curious to see if we can push quantum resistance within 3-5 years. With hard-fork date [old txn cut off entirely within 7 years].