And do you have a timeline on how long it will take for every single let's say US citizen to open and close let's say twice a second layer LN channel with a 1MB block?
There isn't a single second-layer solution developed.
But don't forget if other 2nd layer solution isn't more efficient when moving BTC (between on-chain and that 2nd layer), the problem still exist. Although for sidechain, the problem could be avoided if people buy/sell the pegged BTC instead.
In my opinion, it is unlikely that everyday transactions will predominantly occur on-chain. Most on-chain transactions will likely be conducted by large institutions that will contribute to second layer solutions.
how about this. they invent this card that you can use to conduct purchases and other similar transactions. the company backing up the card has centralized servers. so it works really fast has high transactions per second. no maximum blocksize or anything like that. your card is backed up by bitcoin you let them hold for you. when you use your debit card to buy something, it's not going to appear on the blockchain, the company will just adjust your "bitcoin balance" with them.
Binance card already offers that, it's nothing new.
And so does Coinbase along with few others custodial service.