There's only 21 million of total supply of bitcoin but the estimated year that all of it will be mined is by 2140. But, it's not that a big issue as the total circulating supply now is 18.4 million bitcoins, we're near to it and because of halving it will become more scarce for the next years to come.

While it's still existing and there's a decent market cap, we can have a guarantee with bitcoin. The acknowledgement from different countries and financial institutions is just starting. So, you are right on this quote if you're expecting something positive is about to come.