So would this mean there will be a shortage of the available bitcoin accessible to those who would want to own some of this cryptocurrency?
"Shortage" doesn't make any sense here, Bitcoin is money, it's supposed to be limited. When you look at coin value it looks like it's small, but if you convert it to sats, it's 300 000 sat per person. As for the USD value of 0.003 BTC, it just means that Bitcoin is not popular enough to replace fiat currencies. But if it starts happening, the price will grow enough to cover all the currency needs.
So, we have enough units to replace fiat if we use sats, and even if it's not the case, it's possible to make a fork to even smaller units.