Ethereum is a beast, so many dapps running on it, without ETH we'd be nowhere near to what we are now,
People will realise its value, $2k+ IMO
What do you expect? Its the second crypto and its never been moved on that position (well for a brief moment). But that's how solid this coin is, with its smart contracts and ICO projects relying it as their mode of investments, there's no doubt that it wouldn't go down to $400 again.
But as far as $2K, yes its really possible, but I don't think that we can get it this year though. We may see new ATH again at the end of the year, but not $2K in my honest opinion.