If the universe is destined to recollapse, there will be a time some 50 billion years from now, when the existing black holes and matter will 'crunch' together, but most of the matter will be able to escape being swallowed by the existing black holes until just moments before the final collapse. The geometry of space time will become very complicated at that time with the horizons from billions of black holes merging together and the 'singularities' within them merging together too. For an infinite universe, all matter will eventually become incorporated into black holes, but over trillions upon trillions of years, even these black holes will evaporate, leaving behind a tenuous plasma of charged particles and anti-particles. But there will be no final merging of these black holes into a 'Big Crunch'.