Or, we could wait around another 6 months for the mempool to become unmanageable, and let Unlimited hard fork the network, which could unleash total mayhem.
UASF to Segwit, then:
1) Schedule a minuscule block size increase HF.
2) Prepare Schnorr and signature aggregation.
3) LN, sidechains, et. al.
Litecoin adopted Segwit and nobody cares.
Oh, plenty of people care. It's just that those people are speculators rather than users. As with all cryptocurrencies, the key cause for a price hike is just people thinking that in theory it could be more useful - in reality, Litecoin was nowhere near its maximum capacity anyway so LN wouldn't have made transactions as much better as it would make Bitcoin transactions.
The "dump" is just what happens when there's a speculative bubble caused by an excellent fundamental aspect of the currency (in this case, SegWit and LN) which people try to join before the event actually occurs. When it does occur, people pull out as they expect that the price has peaked.