Shitcoins will never fully disappear because their marginal cost of production is negligible and the incentive to create them will always be there.

There are some shitcoins that are legit in the sense that they weren't put out with fraudulent intentions (like BAT), but they do not have any advantage over the lightning network. In other words, Brave Browser + BAT is a great idea but Brave Browser + sats is even better. I have yet to see an alt that provides value where bitcoin does not.