The problem isn't LN itself, it's the on and off ramps to/from LN imo. We still need to scale for that.
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1. Batching - you can open channels to your whole family with a single transaction.
2. Good article if we really needed to onboard people fast - https://lightning.engineering/posts/2021-05-26-sidecar-channels/
3. fedimint - https://fedimint.org/ Communities can built their own bubbles.
I don't see this a problem. Even if people pushed the price of on-chain transactions way up, people will be capable to open a channel. A bigger problem I see is, people don't trust themselves and will be looking for custodians, which from time to time will rug their customers. That's why fedimint isn't a bad idea.