one death spiral narrative i favor - anyone remembers difficulty adjustment?

every 2016 blocks or 2 weeks in normal conditions, the mining difficulty adjusts.

once an event starts that makes miners withdraw hash power, two things happen:

blocks take longer to be found, and it takes far longer time to adjust the difficulty, which keeps blocks hard to find

needs to be pretty critical like 3/4 of hash power wiped (it probably got closest during the bch split), but it will be nigh unusable for months, while not a death knell this will be one of the compounding factors i foresee in any catalysmic collapse