I don't think LTC will die but it might be forgotten or if not it will be undervalued in the next few years because of bitcoin and some other coins and tokens recently that has more potential in the future. Not unless if they would collaborate on a certain coin for their coin to be upraised again.
If you look at its past, you may find that it is a bitcoin-driven currency, although there are no breakthrough developments, but its existence has always been steady over time. .