Well we cant tell yet on when ETH and LTC catch up to BTC, But as of now its only BTC are smoothly increasing the price. We hope some coins also will be join of BTC increasing the price because that we waiting for to increasing all of coins the prices.
It will be naive to think that it can happen. Litecoin and Ethereum (by the way, why are these altcoins chosen?) will grow, but they cannot catch up with the main cryptocurrency.
Some Litecoin holders believe that this token can reach more than 200 dollars this year, but the alt will be following Bitcoin only. halving can affect its price positively, however.