What happen to ethereum is as simple as people dumped their ethereum and the price of ethereum goes down, when there is a huge supply of a coin and there is less demand, the price goes down and that's what has happened.
If the ether falls in price once again, it is possible to begin a rapid growth. Many people say that the ether will fall and therefore no one will buy a lot of coins for such a small price.
in my opinion there will still be investors who will buy ethereum because the price is very cheap. if there is news that make price will drop further, investors will surely already have lots selling ethereum. but in reality there are still buying, holders will continue to buy ethereum, as some investors believe that ethereum will rise again.