Who knows how low Ethereum is going to go, looking at the historical charts and looking how it's acting I don't see any reason it won't go lower than $80.00, might go below $50.00 or even lower. I'm not doing anything with the ones I have, just hodling, keeping an eye on it and hoping for the best.
It looks like a really good deal now, but then it looked like a really good deal at $500.00, at $300.00, at $200.00 so really I think no one has an answer. I want to buy a bunch of it when it is around the lowest as I think long term it will soar again and by doing so it will cost average down my other more expensive buys.
As has been mentioned, if you don't sell you haven't lost as long as the coin doesn't disappear.