Bitcoin is already divisible to 8 units, and that's more than enough for the world's population. 1 satoshi would cost around $1 when BTC hits the millions, anyways. That's still cheap when you compare it to a wire transfer or even credit/debit card fees.
I think the point was that even if $1 is cheaper than a wire transfer, paying in Bitcoin means paying with no decimals. You go to El Salvador and buy your groceries. You can not pay 29p for a water bottle because you can only pay 1 Satoshi minimum ($1). Practically, it becomes a burden.
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You can already do this with Lightning. You can open a channel and make transactions involving millisats for as long as your channel remains open. If you close a channel which is holding some fraction of a satoshi, then the balance you receive will be floored to the nearest satoshi.
Then Layer 2 (Lightning Network) is practically the solution to this fear of Bitcoin's supply or decimals having to be modified. Right? There are so many threads talking about the issue but never have I seen this solution suggested or talked about.
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Regards,
PrivacyG