after that supply of 100M Ethereum, and like what the other members has said, the value will start to decrease steadly.
Usage is increasing so more gas is being spent, value is added because of the vialibility of this blockchain. This token will more and more be seen as a secured investment. Investment banks and mainstream funds haven't really entered the crypto market yet. They won't purchase just a few thousand tokens.
yeah, 2018 is singled as a year of institutional investments and there is no doubt that it will be remembered as the year of encouraging developments in ETH domain. $1000 is my the least prediction.
After that supply of 100 million ETH, many huge investors will be in and invest in Ethereum.
I admit that Ethereum price is not growing but i am sure Ethereum price will be rise in near future.
We will be see like last year Ethereum hitted above $1.4k, hope so this year ethereum will be cross ATH price.

BTC, ETH and other altcoin always rise in the future the question is when, many have predicted that the price of BTC will go beyond 10k so it did then a huge dump happen and almost every altcoin went down with it some have died. ETH needs a price of its own not get tied with the price of BTC.