Why should this even bother someone that "if everyone...   ...only 0.003btc"?

There are enough reasons why this would be never the case.


only around the half of the earth has internet access. ( why should then almost everyone use Bitcoin )

not everyone will be able to buy bitcoin ( cause they don´t need or afford it )

the bitcoin blockchain will fork in the Future and have a bigger supply as soon every bitcoin is held by a dead person or is lost  (regardless of the worth it could have, there will be no supporter which has an incentive to join/support bitcoin)

The Price with this estimation of bitcoin is a dream ( it´s FOMO. ( marketing is made to make you exited like sugar in the Starbucks coffee is exact at the "sweet spot" to make you want !more!)