Bitcoin when it arrived to the world in 2010 was a new concept and nobody believed in it except a handful of people. Many mined it using their laptops and you might have heard the classic story about the bitcoin pizza sold for 10000$ which is now worth millions which shows how people were irresponsible with money. There were people who accumulated lot of bitcoins through the faucets.
The bull run up to 1000$ powered by the MT.GOX willy bot, back in 2013 made these early adopters millionaires. They started to sell to realize this huge this put a huge downward pressure and thus price of bitcoin was very downtrendy in 2014 and poorly rising in 2015.
But such a thing cannot happen in ethereum, because right in the ICO of ethereum, a whole bitcoin could buy only about 2000 ether, this was because ethereum came to the world where blockchain technology has been established and people believed in it. Therefore ether is now distributed in the world in a much more responsible way than bitcoin is and therefore there is no way that ethereum would crash like bitcoin.
Ethereum will continue to climb and nobody can stop the ascent to 1000$ within this year and after that it might reduce a bit and stay at 950-980$ for few weeks and rise again and consolidate around 1500-2000 for a long time perhaps a year. If Ethereum becomes very successful like governments implementing ethereum then it will climb to 10000$.
There will be only rise, and consolidation but crashes like bitcoin will be rare in etherland.