You DO know that ETC is an ethash coin, and therefore the E3 WILL mine it?
Yes but as you said that it won't hurt eth mining much. I want to know your opinion about mining etc if could be more profitable in future or long term.
Once ETH goes Proof of Stake fully, ETC will be INFINITELY more profitable to mine than ETH will be.
We just don't know "when" that will happen - even the devs can't give a firm date, just an estimated target (that they have missed a FEW times for various reasons).