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?
The question should be, do we know what the future holds? No! If we all knew as at 2010 that bitcoin would be worth about $6000 this period, wouldn't we all be extremely wealthy by now?
It is a game of chance, it might experience the same level of increase, it might not... what is important is to be hopeful and know that you are part of something great and maybe one day it may end up extremely worth waiting.
I noticed people saying it is better you get altcoin, sure! As you may end up lucky to hit a good project that could even give you a huge profit, but does that mean the same amount in USD of bitcoin won't be worth much more eventually?