Famous last words.
It's not the fall that kills you, it's the sudden stop at the end. Change, even massive change, is perfectly survivable when it's spread over a long enough period of time. 100m of sea level rise would be survivable over the course of ten millennia. It would end human civilization if it happened tomorrow morning.
Society is already struggling to adapt to the rate of technological change. This could easily be the tipping point into collapse and regression.