The blockchain will evolve and developers will create solutions to potential
problems and also to tweak existing issues.
Bitcoin is evolving, Segwit and the Lightning Network are 2 additions to the
bitcoin blockchain.
Lightning network is a separate network that many coins will use. its a multicoin network not dependant on bitcoin and not a sole feature of bitcoin.
its just a separate tool for people to lock the 8 decimal real coins up. and then play with unconfirmed 12 decimal tokens on a separate network. lightning does not offer the security concepts that a blockchain does. instead its a network where people have to rely on other people to be online and able to accept and pass on funds like a game of hot potato. it also has things like chargebacks and x time delays for releasing real funds(CLTVCSV and revocation= bankers 3-5 day dlay and chargeback)
the 'benefit' of LN is when everyone including the destined payee is online. payment of unsettled funds can be done faster. LN is to many coins what visa is to many fiats.
saying ln is a bitcoin feature is like saying Visa is a dollar feature. meaning very narrow minded until you travel around the world and realise visa is used for pounds,euros.
many people are too complacent that LN is the only solution. the only future. but the reality is that LN is th backward devolution moving away from blockchain and moving back into the concept of locking up real value and playing with a second entity/group that you require their consent.
.. like gold in the 19th century turned into the banker era that people dont handle real gold anymore.