I doubt that any altcoins, ethereum included, will ever go that high. Even if it does(probably due to the lack of coins in the network, like 42coin), it won't overtake bitcoin in terms of usage, and actual adoption. It'll only be traded as an asset, not used as a currency.
But it'll be interesting to see if ethereum actually goes that high. If it does, then you'll be filthy rich
You can't really tell in the future because inflation will be a component too.
There is application of Ethereum in the fund raising and the smart contracts. It might take off in the future.