I don't think it will become 50 dollars. Because for now price is near to 200 dollars and I think that is the minimum price of ether this year and ethereum will start pumping again in the next few months and when the next year will come for sure.I do not want to see ether become very low value.
Gosh, Ethereum will not fall so greatly! I suppose, the minimal price he can reach is 150-170 dollars. However, i believe, it will be stable for some time more to start its bull run this winter.