As others have said, black holes just grow and do a great job of it. At one time, there was some serious science support a Big Bounce: Essentially all matter would get eaten by all the black holes which, in turn, would get eaten by bigger black holes. Eventually, all matter would be condensed into a single black hole. Then, somehow, that would explode and create a new Universe.
Now, we are probably on what I choose to call the Big Black. As the expansion of the Universe continues, the rate of expansion is increasing. At some point, you’ll look out at the night sky and not see other stars/galaxies. This is not happening next week obviously.
Since Hawkings paper that ‘black holes have hairs’ it is assumed that – speaking in billions and billions of aeons, black holes will evaporate. “From WikiP, For a black hole of one solar mass ( = 1.98892 × 1030 kg), we get an evaporation time of 2.098 × 1067 years—much longer than the current age of the universe at 13.73 ± 0.12×109 years.” http://en.wikipedia.org/wiki/Hawking_radiation
Other fun things to happen: There might be a drop in the vacuum energy in one part of the Universe. It would expand and destroy our Universe at the speed of light. Likewise, we could have a new Universe, potentially with different fundamental constants, pop up somewhere in ours. Again, we get destroyed. These are the things that keep me up at night. ;)