No, a giant black hole will not consume our universe. Remember, black holes are deep gravitational structures, not cosmic “vacuum cleaners,” and they do not “suck” things in. Picture a manhole in a construction zone on a busy city sidewalk: if you fall in, you may not come back out again, but if you avoid the hole and its environment then there is no danger. A black hole works the same way. No matter how massive a black hole is, there is always a limit to its gravitational influence, and matter that lies beyond that limit will not be affected by the black hole at all.