Two things to consider: 1) The volume of space a black hole influences doesn't increase without bound. If our sun collapsed suddenly into a black hole, it wou

Two things to consider: 1) The volume of space a black hole influences doesn't increase without bound. If our sun collapsed suddenly into a black hole, it would have the same exact pull on the earth (i.e. we wouldn't suddenly be pulled into the black hole) 2) It is hypothesized that black holes do evaporate slowly (see Hawking radiation http://en.wikipedia.org/wiki/Hawking_radiation http://en.wikipedia.org/wiki/Hawking_radiation)