It can't really go nuclear. There are no nucleus in there, except for new arrivals.
Even in the inner regions of neutron stars, the particles are no longer bound in nuclei.
Black holes seem to go on as long as they are fed new matter. If not, they will slowly radiate away.
What happens to a black hole that radiates long enough to lose it's required mass, is an interesting question. Perhaps it pops back into a star?

I don't think the universe is old enough for anything like that to happen.
Black holes are strange to us, because they don't fit our perception of the world. We are used to thinking that stuff has volume. I reality, nothing probably has any.
A hydrogen atom is like an orange and golf ball on a football field. The rest is just space. The proton at the center is made of quarks, with mostly space between them. It wouldn't be a great surprise if we discovered that all matter is made of singularities bound by a forces in a mesh.
That would make black holes rather basic objects.
If i compare it to a water vortex, the pull and rotational forces are already extreme,
IF theoretically there was a giant whirlpool you got caught in, not the water but the rotational force would knock you out.
(referring to what you said)
So, if we assume the black hole is similar to a whirlpool(water vortex), spits out the torn mesh matter garbage, what would happen on the other end, i would assume the Black hole's gravity curve is mirrored on both sides, would the force
a) create new particles in the process (cause everything is kinetically charged) similar to the mechanic of the Large Hadron Collider?
b) come out at the other end, basically being turned into antimatter?
or c) won't be able to escape the pull of the black hole alltogether?
Without taking astrophysics into consideration, just from a mere logical standpoint, i would say the trail of matter is pulled through,
gets separated to the smallest possible denominator and once it exits, forms new matter. I don't think it vanishes completely, but leaves behind something similar of what a supernova excretes.
And i also totally second that bit about the black hole dying if it's not fed any matter. If you turn off the water in your shower, that little vortex that's so cool to watch, dies off too.
(far fetched analogies, i know, but that makes it easier to try and visualize the possible effects a black hole might have.)
But not even Stephen Hawking could come to a definitive answer, and he thought about all the angles pretty much every single day.
Sorry if i don't always use the right words or descriptions, i could express that much better in German,
i'm pretty good at English, but when it comes to physics or math,
or certain names that vary from language to language i'm reaching my limits.
So i might sound a little more stupid than i actually am. ;D