Is the big bang just a big chunk of matter that entered a black hole at the same time?
What will scientists think in the year 2030?
This is great, but I don’t think you’ll get a consensus of scientists agreeing with the claim. Even though it might be technically true that the mass and density of the visible universe meets the mathematical standard for being dense enough to be a “black hole” there’s no way to verify the other contextual facts that would make it a stylized black hole. A black hole forms in a universe, probably from a large star, subsequently sucks in matter, becomes larger and larger, has an event horizon, probably has a galaxy around it that eventually gets consumed, etc etc. The universe might be a black-hole-like phenomenon but we would need a lot more information before declaring it a bona fide black hole.