Yes bitcoin is getting more and more popular day by day worldwide, and it will grow more when the adaption level reaches on the top, and once the users starts using bitcoins as a currency the future of bitcoin would be pretty good.

The future of the bitcoin is pretty good, so it would be stupid to sell now.
I think the bitcoin will be the next currency of the world, it has a great potential.

How do people come up with these numbers?

Of all the crypto currencies available, Bitcoin is the strongest. The only way to keep it stronger is by not allowing it to be controlled by any entity. If banks and governments want to buy it, well and good but they should not be allowed to regulate or control it.

I don't think there is a possibility allowing to someone or some government to control Bitcoin
It's depending in the network and Blockchain and the mining work, and also the halvings

yeah you are the totally right if bitcoin want to make worldwide currency then its too difficult the reason some country are thinking it is illegal currency so user's would be try to spreed about bitcoin everywhere and people would be force to government accept it after that possible.

If the digital currency becomes very popular, and everybody uses it. There is no reason for fiat to exit.

Thinking the same the bitcoin will get popular in the future, its already getting bigger everyday.
So its the question when it will be big enough to take over the world, we need more people that see the bright future of the bitcoin so they can invest in it.

Yeah, the mindsets of the people should be changed then only bitcoin will grow in future, if bitcoin doesn't get enough support from the society then there would be delay in bitcoin getting on mainstream, but bitcoin will survive long for sure.

There's a great chance of success if it is promoted by famous personalities then it can reach to a next level as proper and positive promotion of bitcoins is very important and it will judge its success or failure in the future, if the adoption level keeps on going higher and higher then bitcoins will surely survive.