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.