Right now there is another way, and 4 years from now you'll wish you had been doing that instead of moaning on a message board.

If Bitcoin continues to grow, it could be comparable to Visa.  But then there's still room for Mastercard, American Express, and Discover.  If you want a million dollars for a $100 investment, look at which altcoins have that potential.  Me, I'm working both angles - if I buy 1BTC and it gets to be worth $10,000, I still won't be able to retire early.  But if I buy a bunch of altcoins and let them grow into 20BTC, and then those 20BTC are worth $10,000 each, then it's a good start.  

Besides, have you even thought about what you would do with a million dollars?  I mean, would it really make you happy?  Or would you be online 4 years later, saying "I wasted my time chasing bitcoin and a million dollars, and I missed the chance to get married and be happy."