What do you think will happen in 2017? When it was possible to receive 1000% in a few days ...
Absolutely definite it will repeat. Crypto is volatile largely because so much of the price is based on expectation of future utility - everyone is guessing what crypto will be worth at some indefinite point in the future once it is part of everyday life. Until that time comes of full integration of crypto into society, we will remain on the rollercoaster.