https://hackernoon.com/the-ethereum-blockchain-size-has-exceeded-1tb-and-yes-its-an-issue-2b650b5f4f62
The article also discusses about block propagation, network latency, node centralization and network demand.
So, they are just waiting for Bitcoin Core developers to do all the work and then they want to copy what Bitcoin does. In the end, if the Lightning Network is hugely succesful on Bitcoin and on-chain scaling over at Bitcoin Cash fail, then Bitcoin Cash will just implement the Lightning Network.
They will need Segwit. I hope they implement it. It will be a win for the Core developers.