I expect that at the end of this year or at the beginning of 2020 we will see a new Ethereum and the price for a coin will be more than 400 dollars.
We'll see. After all, Ethereum's been delaying it's PoS upgrade for quite some time. The only way that Ethereum will reach new ATHs in price, would be if such upgrade takes effect into the Blockchain. Other than that, people's interest into Ethereum will decline. Ethereum's upsurge in popularity and price was largely attributed to the rise of ICOs. Now that ICOs are a thing of the past, Ethereum is starting to become old. We already have various scalable smart contract platforms (TRON, EOS, ADA and others) which are far superior than Ethereum itself. At any time, mainstream startups and companies could decide to use these Blockchains on top of ETH because of the many benefits they provide.
Which is why, I believe that Ethereum's Casper PoS and Sharding upgrade is a must in order to gain traction within the mainstream world. After that, hype will rise in the same way as 2017. In effect, Ethereum's demand will reach new heights where there will be FOMO across the crypto market.
Nonetheless, Ethereum may be getting old but it could survive if its competitors lack mainstream adoption. The first-mover advantage of ETH might prevent any other cryptocurrency from taking its place in market cap. We'll just have to wait and see what the outcome will be for ETH within a couple of years from now. Just my opinion