Wow. Thank you very much for all the kind advice and the arguments for both LTC as XRP and ETH. This is helpful for making up my own mind. I will not sell my LTC for XRP right now. I keep both coins.
If you are having both and just keep them all. XRP will do an airdrop for the users and you will be received free airdrop from your XRP called flare coin which will be a forking coin from XRP. It maybe will worth a few pennies but since it's a free coin and I think that's not a big problem. You can even convert LTC and XRP into better coin like ethereum or bitcoin.
The best way for you to get capital return through use the reliable coin as your investment.
that's it.