Dash and litecoin are in no way a threat to Bitcoin anyway. They don't have more or even the same amount of users even if they are combined. Moreover, like was rightly noted before in the thread, the Lightning Network is not exclusively built for Bitcoin. It can work with other Blockchains, and I have recently seen an article on LN application to Monero or something like that.
LN does not necessarily mean more Bitcoin followers, and bitcoiners don't widely recognize LN. This project is pretty interesting and successful, but it's not even a long-term solution to Bitcoin's problems.