Yeah, I think in the future and even now to some extent we won't really need coin join. But lightning is not magic(for those reading this. Darth knows this very well). Part of this will be the increase in bitcoin usage driving up on-chain fees.
The other thing is that adoption grows most people will be paid in bitcoin not exchanging it for fiat. They will likely be paid off-chain via lightning.
I've said it before but thanks for your guides @DarthCoin.
I will let you think about something....
Through a LN channel of 10M sats you could "coinjoin" 10 BTC. When you close it, it will remain only the info of 10M sats on one side or another and nothing about those 10BTC you passed through...
Let them fight over onchain coinjoins, do your stuff over LN...
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