But that's not what's happening now.


The miners are threatening these things, not doing them. Let's just see where their big-talk leads, besides, we already have effective ways to defend against these attacks anyway.


I'm increasingly less concerned, more and more people are showing interest in both Flag Day acitvation for Segwit and/or PoW change to Cuckoo Cycle or suchlike ASIC resistant hashing algos. The revolting miners are going into the space heater business, and that's their prerogative.