Now replace each instance of "
LN" with "
centralised exchanges" in that quoted text and explain why Bitcoin isn't dead already. People already have the option to leave Bitcoin in favour of an altcoin, so LN will be no different in that regard (apart from the notable exception that it's better than trusting a centralised exchange with your funds). Clearly BTC still has enough value and utility for people to keep using it.
Definitely sounds like something that doesn't match up with reality. No wonder you said it.

comedy again.
yet people are already doing it. loads of people that use exchanges exit the exchange not with BTC but by using altcoins so that can arbitrage value to other exchanges without delay.
take the whole purpose of USDT and stable coins.
even back in 2012 people were arbitraging via litecoin instead of bitcoin.
some where even using bitinstant 'codes' via the reserves to move between mtgox, bitstamp and btc-e without having to exit with BTC
its why exchanges have such huge HOARDS. .. because not everyone is taking their BTC out
think logically
people us a separate network service thats micropenny cost and no delay.. you think they are going to choose a slow costly blockchain or a cheap speedy blockchain
.. and dont try the whole "bitcoin worth XXXX while altcoins worth XX".. because people are smart enough that if they have $6k it does not matter if they put it in btc or altcoin. because they will get 1btc or 100altcoin which both equal thee same value
EG people doont buy 1 gold bar. they buy several ingots, hundreds of ounces as its then easier to move than a bar, and doesnt cause as much dust to break it up when making split payments