Yeah, the world will end someday, nobody knows when or how it will happen. What will lead to it?
To be honest, the world ends when we die and that's the end of the world. There's no world for someone who's not alive anymore.
That's really good one.
However, there's possibility that in future the Earth may also end and who knows if people might find another planet where they might be able to live, but I doubt that thing.
Earth will end or become barren due to sun aging and it becoming super giant but it's billions of years away (if we are to believe YT videos), but this will make other ice frozen planets and moons (example, Pluto) to potentially have life, and if those planets have life we'd be making there.
..and look at how much progress we have made in space science in last few decades, before earth reaches that aforementioned risky stage, we'd be unfathomably more advanced than we are now.
Elon Musk is giving dreams to many people to live on Mars but that sounds good as fiction but in reality that's going to be his worst project ever I think.
Musk might not make it to the Mars, but someone is bound to make his plans a reality sooner or later.