If someone bought $100 of Bitcoin in 2010 and kept it until now, they would now have around $6 million.
Do you think the same could happen again in the next 7 years? If I now own $500 in Bitcoin could that be worth $1 million+ in the next 7 years? Or is it extremely unlikely for this increase to happen a second time?
There is no upper limit as far as bitcoin's value is concerned so it can happen for sure. As for the likelihood, I think it is pretty likely. Bitcoin is continuing to rise and it does not look like it can be stopped.