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 are too many factors that defines the ultimate fate of the bitcoin and its prices. Going that much higher is speculated by many investors and big players but there is also downside of the coin. Its decentralised and no government will tolerate that much hike in the rates of bitcoin because it will simply kill the market of national economy and could lead to threaten situation. So before you can reach that price it may get legalised or capped at some rates.
You can try to replicate that past with alt coin. Yes, whatever you spoke is 1000% hike in the rates of bitcoin which is also possible with alt coin now and they are very cheap. You can put huge amounts of money into it and try to grab that opportunity.