All people in the world to use Bitcoin? Nah, that's unrealistic and will definitely not happen. I think we may be happy if we at some point manage to get 5% of the world population to adopt Bitcoin. 5% of +7 billion = at least 350 million people.
If 350 million people use the bitcoin regularly, the price will be over several hundred thousand dollar each bitcoin.
$350 million will be the active users of the bitcoin. If so, the bitcoin price will be more than 1000 billions.
Huh? First you come up with $100K per coin, and now more than $1000 billion? Please share your way of doing calculations, because to me it seems you're just trolling...
Sorry, I meant the bitcoin market cap will be over $1000 billion, when the price is over $50,000 each.