It's extremely unlikely it's going to suddenly disappear, we're also talking about the only cryptocurrency that could even seriously compete with BTC, with the upcoming fork in Bitcoin I think regardless of the result there will at least be a temporary flip between Bitcoin and Ethereum, given that ETH is relatively cheap right now and Bitcoin is coming up on an event that might re-define what Bitcoin actually is.
I think that regardless of market corrections and a drop in prices due to a lack of faith in the market, cryptocurrencies are still very much in their infancy and as the FIAT money is becoming increasingly economically unreliable in comparison, over time they will gain dominance.