Actually Ethereum is a good enough currency to invest and maintain for a long time, since its price has dropped a lot and at this moment it can be used to have large long-term profits, but there are also several good currencies to invest as Ripple, Monero .
Ethereum is a kind of asset that has a viable and reliable flatform to transact, it also suit for long term investment to gain enormous profits when the market gain the stability from its downfall. And as long as the market has not recover yet, grab the oppurtunity while its on dip.