How exactly does a higher fee make lightning less viable? Lightning channels opening and closing are dependent on fees, but the channels themselves are completely immune to on-chain fee fluctuations. If anything, what's happening on-chain is even more reason to embrace lightning development.
The sooner we barely need to acknowledge the chain to do 99%+ of transactions, the less the scalability tradeoff of on-chain activity is limiting. And as long as there exists the necessary record trail to the chain to prove the bitcoin is real and not fake (which lightning does perfectly) everyone knows that the money is real, even if most people never transact on-chain.