With a hard set total supply limit of 21 million Bitcoins, excluding those not already mined and others that have been lost, there can only ever be a maximum of 1 million Bitcoin owners who own equal to or more than 21 Bitcoins.
Do you class them as the new Bitcoin millionaires?
Per definition a Bitcoin millionaire can only be a person who owns at least one million Bitcoin.
Even if you mistakenly measure wealth in fiat trash money, this thread is nonsense speculation and a great example of excessive optimism during market moves. So a correction may follow quite soon.
Measuring wealth in fiat money makes no sense, because fiat money is subject to significant monetary inflation. I'm quite sure that in the more distant future, 21 BTC might be valued at 1 million USD. However the buying power of the USD will be much lower by then.
ya.ya.yo!