I calculate the main prices of ETH and also BTC price regarding the mining process and costs. miners are the main people that affect the price of BTC and ETH. if the prices of coins will below the mining costs, the mining will not affordable. in general, if we consider the average prices of mining in all of the world, we conclude that the lowest prices of BTC is about 6000 to 7000$. and this amount for ETH is about 400$. so if ETH decreases more than 400$, the mining of ETH will not affordable and miners will migrate to other alts. so this migration will cause stopping the mining of BTC and ETH and also will cause the price of the transaction. in long-term, this causes the raising of the price for ETH and BTC.
Ethereum fee us very cheap now, that is the time to put money into ethereum. hold the ethereum coin for long term will supply more benefits than you invest. This coin is a excessive capability and promising cash inside the coinmarketcap. After bitcoin ETH is the second one biggest and strongest coin. so many ico's now prepared to spend money on this. because of its blockchain generation it becomes an increasing number of popular nowadays.