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I'm not completely sure that the price for 1btc will reach $1mn and the price tag of $100m is already something not real. if bitcoin were accepted as a form of payment all over the world, perhaps 0.01 btc would bring a huge income, but if you really look at it, it is unlikely that something will turn out.
10 years ago if you have ever looked, many people never believed the price of Bitcoin would hit $50k, in fact Bitcoin has crossed $60k
it may take a long time and also 70% of the world's population for Bitcoin to touch $1 million, but I'm sure this will happen in the next few decades