Black holes, once they exist, don't go away again until they evaporate via Hawking radiation, and that's a very slow process for even a relatively small black hole. Also, just creating a small black hole somewhere in a solar system wouldn't destroy it unless said black hole was of stellar mass--black holes are not the cosmic vacuum cleaners of legend, if you were to somehow convert our Sun into a black hole right now the planets would continue in their orbits as they have for millions of years. Everyone would die because no more sunlight means everything gets very cold very quickly, but they wouldn't get sucked into the black hole.