i dont think that Litcoin have any demand but ETH do have a big demand. To share the payment mainly Etherem are shared. ETH price will rise within 1 year but Litecoin will going to take 2 years to grow. Even the price of Litecoin is less.
LitePay is out now, that changes everything.
I'm now very bullish on LTC now than I was before.
But yeah, smart to diversify your investments, IMO. You only need one to go to the moon (if not several) -- but don't bet on shit coins (do proper research yourself and be sceptical of any biased FOMO or FUD being spread).
ETH -- also have excellent long-term promise too; and is considered as the 2nd generation crypto with its smart-contract capabilities.
And even Bitcoin Cash (BCH) is now showing a lot more promise with its aggressive push for adoption and development.
And Stellar too.
The thing, IMO, is that even though BTC is still the most establish coin with the least volatility -- it also mean that it has less long-term potential for a high %growth as it did before (but less risky maybe) compared to the lower MCAP coins.
I myself am betting a little on the higher MCAP altcoins aiming to become the 3rd Generation cryptos (such as Cardano, NEO, etc.), and decentralized exchanges such as AirSwap.