-snip-
Your entire analogy is flawed because the banana is not being made bigger. It is the same size, but being cut in to smaller pieces. If you add three more decimals to bitcoin, you have not increased the cap by 1000x. The new smallest units are a thousand times smaller then the old smallest units. There is the exact same amount of bitcoin in circulation as there was before, regardless of whether you consider it as 21 million bitcoin, 2,100 trillion sats, or 2.1 million trillion millisats.
If you add more decimals, you are cutting up the same amount of bitcoin/banana in to smaller pieces. Only if you raise the marketcap is the bitcoin/banana being made bigger and less scarce.
Satoshi talked about even moving the decimal point, let me alone just adding more decimal places:
If it gets tiresome working with small numbers, we could change where the display shows the decimal point. Same amount of money, just different convention for where the ","'s and "."'s go. e.g. moving the decimal place 3 places would mean if you had 1.00000 before, now it shows it as 1,000.00.