SegWit was not the only solution proposal for transaction malleability; remember BIP62 with Pieter Wuille’s proposed tweaks to the BIP in July 2014.

SegWit inadvertently prevented covert ASICBoost.

Incentives for UXTO consolidation could exist without SegWit discount; transaction byte size fee payment encourage already UXTO consolidation.

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Discussion

BIP62 is partially implemented, but the remainder is withdrawn. Afaik it wouldn't be enough to be safe for Lightning, but you'd have to ask (Sipa on) the Bitcoin Stack Exchangs.