Actually, if you have 100 bitcoins you will be hundred-bitcoinnaire by 2020. Being a dollar millionaire won't make any sense because the dollar will be long gone by then.
2020 is just 4 years away. The US dollar will still be the world reserve currency. It is still the strongest currency.
Well when bitcoin becomes stronger dollar too becomes more strong. So as mentioned in terms of bitcoin one can but when calculated in terms of dollar nothing can be said in a exact manner as price variation occurs often.
I thought the purpose of bitcoin becoming strong is to move away from the fiat money lol.
But in order to be on the same level as of the dollar level, it would need to match its inflation.