Like you mentioned, it is listed in all the exchanges and accepted in all gambling sites.
Gambling is how I first got my big chunk of LTC. At that time, it was among the few coins that was quick and cheap to transact with, because back then, BTC was slow and starting to get costly.
I am using Litecoin for gambling and I am not looking at it as a long term option to make a huge profit. The sole reason for using it is there is no delay and the fees are really low. While the transaction fees for Bitcoin are also not that high either, but it is fun to gamble with a full Litecoin than having a few fractions of satoshi.
It's not really that fast now if I am being totally honest. It takes a good 5 mins, which is a long time given how many alternatives exist now. There is XRP which is instant, then there is BNB, which is quite fast as well and is cheap too.
I think the future of LTC isn't great but I don't see the coin fading away anytime soon either.