FWIW, I believe the lightning network is already setting the standard 'millisat' (1/1000th sat) for when the need arises for smaller units. As the OP points out, changing a unit of account (even sats) would likely cause way more problems than it would purportedly solve.
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If 1 Sat every equals $1, or $10, or even more, then it'll be so obviously needed that the network will be updated. IMO this is just a matter of time.