Bitcoin market cap is about $2T as of today. All world assets are valued at around $900T today. Let's say in 30 years this number may climb to $10,000T due to money printing.

In extreme case, Bitcoin may capture all world assets, and therefore its market cap may increase 5000 times - from $2T to $10,000T. [ I disregard 1.3 million additional Bitcoin left to be mined on top of existing 19.7 million Bitcoin already in circulation because this entire calculation is so imprecise]

At roughly $100,000 per BTC, today 1 sat = $0.001. If in 30 years BTC price increases by the factor of 5000 then 1 sat = $5 in remote future.

30-50 years ago, you could buy something for 5 cents, but now 5 cents is worth almost nothing. Similarly, $5 will be worth very little in 30 years, and therefore there may be no need to subdivide 1 sat into smaller chunks.

Even if LN fees get very small and measured in fraction of a sat (which I believe is already the case), there is nothing wrong in using fractional sat, milli-sat, or even micro-sat similar to how in metric system we use fractional meter, millimeter, and micrometer.

There seems to be no good reason to make drastic changes, especially considering the fact that BTC and sat units have been widely adopted, cause no confusion, and honor Bitcoin creator.

What is reasonable is to implement fractional sat (e.g. 0.2 sat), milli-sat, and micro-sat.

Just my two sats... LOL