RE: EOS with DPOS is immune to the GFW attack _because it is more decentralised_
Does it really matter if BTC loses 80% of all its hash power? Won't we suddenly get new miners appearing because the network will adjust the difficulty and it'll be more profitable to mine elsewhere again? Sure we'll get a defacto fork without all the Chinese miners if they are going alone on the other side of the GFW. But pretty quickly if they are shut down the rest-of-the-world chain will be so far along that the Chinese one will be irrelevant.
However, to be honest, I don't fully understand the details of the BTC protocols - is there actually something that causes the system to break if 80% of the miners drop off the net one day? Or is the impact purely limited to an effective fork without them, which should, as those miners actually get shut down, very quickly become the longest chain of blocks and hence the de-facto BTC and not just a fork.
Happy to be schooled on my errors about BTC here, I'm just asking. No disagreement with your theory about EOS - other than if Ethereum goes to POS it too could be "better than Bitcoin" in this regard. I really do hope that will happen but that too seems to be a huge hurdle for ETH to cross.