I think that 50$ per Ethereum is unlikely to happen in nearest future , but someday it can become real . We don't know what will happen with Ethereum in 2019 or 2020 year , maybe it would be replaced by EOS or NEO , who knows ? Or a whole crypto will be banned and all crytpo assets will worth nothing ?
Yeah, as it there is a possibility that it gonna down as much as $50 but I don't think it will suddenly happen. I would say, maybe it takes time in which most popular crypto currency like ethereum will definitely recover after tremendous downfall. Well, its just my opinion since I just refer in the previous performance of ethereum. I believe that soon ethereum will definitely increase but I don't think it will gonna down as easy as $50. 