At the moment segwit doesn't help litecoin at all.
This is nonsense. Segwit wasn't designed as a capacity increase. The capacity increase is a side-effect of it. List of benefits:
Malleability Fixes
Linear scaling of sighash operations
Signing of input values
Increased security for multisig via pay-to-script-hash (P2SH)
Script versioning
Reducing UTXO growth
Efficiency gains when not verifying signatures
Source:
https://bitcoincore.org/en/2016/01/26/segwit-benefits/When listing benefits, any competent person would always list both pros and cons. That's to avoid being bias. So can you list the cons please? That would include what happens after segwit gets activated... LN for example?