2017 Majority of the altcoins reaches their all-time high and 2018 is a big turn around some coins hit their bottom low, what is this big factor or major update that can get make all the coins to reach their all-time high again.
Unless there will be a major adoption of cryptocurrency worldwide, there will be an ATH again just for my opinion. Another thing is when Government around the world starts to adopt crypto to a country, we can say an ATH awaits.