The Lightning Network can take a huge amount of transactions largely offchain. The idea of having all transactions fully onchain is not a matter of principle, it's a matter of control from miners so that they can receive transaction fees more often. SegWit allows a slight increase in onchain capacity which is enough for the short term while this offchain scaling can also be implemented.
You're wrong because off-chain transactions are against the nature of Bitcoin and Satoshi vision. All transactions must be ON CHAIN due to many reasons, technology is not in cause here. The decentralization model should also be for Core Dev we have to rethink the process of BIP proposal and reward Dev for it.
For exemple Bitgo Instant is great tool and might be considerated as Off-chain transactions network. You don't need a solution On the network but Off the network it's called business man