Well for the most part me trying to follow budism but apart from that it just seems too messy without, going along the BB thoery the universe had all its mass in 1 spot smaller then an atom and it basicly exploded. so if all the universes mass could hold it in the singularity (which is really what the BB came from as its a major error in any equation we currently could make. So that gravity well it came from still exists in every piece of matter and is acting on the whole of the universe, so all matter will eventually slow itself down to a stop (excluding zero-point field interaction which is a possible reason for the big bang) and then will slowly begin to pull itself together. Also the magnetic fields like jupiters and other planets and stars will effect the others and attract and polaritys can be changed by larger magnetic fields so even if one body is repelled by the magnetic fields at first once a big enough magnetic field or gravity well is formed it will attract it again. So to me everything points to the big crunch being an inevitable fact.