How do you think the world will end?

Yep. All matter including light gets crushed into an infinitely dense singularity. Gravitational waves are the only thing in the universe that can pass through a black hole (and do so as if the black hole weren't even there).

I think some scientists may believe it's not a point of infinite density but a ring, through which something with enough power could traverse and avoid hitting the ring.
 
I really don't even care to hazard a guess about anything related to black holes. That shit is so advanced it is pretty much impossible to have a relevant/informed opinion on it unless you're actually an astrophysicist.