So it's safe to say the 30% that left bitcoin did it's damage by clogging up the network
What damage was there? Bitcoin worked and is working as it is supposed to.
It seems to me that the only damage done was to the reputation of those who moved their hash rate to an alt coin. But that too is fine as they are free to do that.
Now we see the many bitcoin mining pools moves to mine the bitcoin cash since that value increased in the chart. Everyone would expect the bitcoin to reach the more value but bitcoin value correction will be increased and miner will again turns to bitcoin.
I am really happy that bitcoin price started increasing again and it seems again grown to 6.6k USD in the chart. I have heard that some big mining group gone to mine BCH.