If you bought bitcoin last 2010 then yes your now a millionaire if you haven't bought wait for 2018 because bitcoin will largely fall next year and then jump high by 2019.
I agree to you that if he bought bitcoin on the year 2010 the he's a millionaire. But for me if you work hard everyday just to earn bitcoins you can be a millionaire as well but in a long time hardworking because the price of bitcoin this year is very expensive and very high that you can buy things what you need in your everyday life.