Its possible that you are right, but I think Litecoin will not disappear, because he still has fans and those who believe in him. Litecoin would not have grown 3 times in the first quarter of 2019 if he had gradually died and was about to leave the world of cryptocurrencies.
I would argue with those guys who doom Litecoin. This is the cryptocurrency you can trust. Now, we need to pay more attention to this token (the time of its halving is approaching). I trust it much more than EOS, for instance.