In my opinion, Bitcoin is not just a currency. Bitcoin is a technology (Blockchain). It's a revolutionary technology in the world of Internet.

In my knowledge the last revolution was Invention of Internet and after that Blockchain Technology is the only thing which is growing day by day.

Soon we will able to see global adoption of this technology. Bitcoin is base of cryptocurrency and will remain forever till this blockchain technology will stay in existence.

As we can see year by year bitcoin's value is increased and till global adoption i can say it will keep increasing.

So Bitcoin can not be worthless till blockchain technology will exists.

Thanks !!