The difficulty and price of the ETC is about 12% of the ETH. That is a good achievement. Will that last?
I dont know but my theory is that every equal or similar thing eventually balances out at 50%, which could happen with ETC/ETH as well.
It depends on the enviroment and the shilling vs censorship factors.
When the hacker starts to dump his/her ETC coins, the ETC price will crash and the miner will desert it.