I agree with you, I'm sure also LTC and ETH will soar its price according to your prediction. Since 2018 there will be an increase in the volume of the coin. And it is not possible LTC and ETH will be over BTC but the price of the coin will continue to rise its price according to your prediction
ETH has a product and they're developing like crazy, but LTC is not that good. It shouldn't surpass ETH in any case but it seems chinese manipulators will play with LTC's price these days.