Until when ethereum will continue to decline, will it touch at the price of $ 50? 
It shouldn't have fallen like this.
December this year is very different from December 2017. The situation is reversing.
its normal for a price to go down, if alot of people sell their coins at the same time, since cryptocurrency is volatile expect it to go down alot compare to the stock market, but since it's also volatile it can give you huge profits which you wouldn't be able to see at the stock market, its a double edge sword. It shouldn't have fallen like this. December this year is very different from December 2017. The situation is reversing.