I think this is for sure the way, with Cahsu. And a separate wallet/mint, just pulls form the background, minute by minute, zero cognitive overhead (just have to fill up the nuts from time to time).
A lot of people do pay on YouTube, YouTube Premium has has 125 million subscribers and will hit 200 million soon. So I think enough people will pay.
If one HD view is $0.001 per minute in CDN costs then $10 gets you 10k minutes, which is 7 full days 24 hours a day. If you double that for some profit to the creator then still pretty reasonable.
The trick is to engineer all that #cashu stuff in the background, payments being made every minute under the radar. Lightning even with 3% fail rate not going to cut it.