I think there are around 200,000 ULTRA HIGH NET WORTH INDIVIDUALS (over 30 million USD net worth) in the world... the dream number I wish I could reach in BTC was 1/200,000 of total supply.
STEEP! Even at today's prices!

The total market cap of all fiat currencies (~$60trn) split between 200k people is $300m each, not $30m. If bitcoin takes over all existing currencies you therefore only need one two-millionth of the supply in order to have $30m worth, which is only 10.5 coins.
So we should aim for the 10.5 coins. That is not a too hard target for most people. If we can save $100 a months, that is 30 months saving.