Heat death, leading to homogenization, equalization of entropy, presumably forever. When the Universe is so homogenous and entropy ceases to increase, there will not really even be any way to measure time. The Arrow of Time will continue "forward", the Universe will continue to expand, but there won't be anything past virtual particles in the mix. I personally don't put any stock on Renormalized Virtual State (and its inherent principle of infinite probability) which states on a long enough time scale, virtual particles will make another hadronic Universe. That sounds like a typical renormalized probability trick to me.