The biggest adoption challenge for Lightning:

The Solana Foundation ....is currently printing USD billions per year out of thin air, and therefore can pay off everyone from Phantom Wallet to Venmo to advertise their token.

Solana's token is also fast to transfer, and works as a stablecoin.

Weirdly: Maybe Lightning needs a Democratic administration to win, and crack down on token scammers... Then it will be clear that Lightning is the real choice.