Example. We can get a due date for when a baby is supposed to come....but no idea *EXACTLY* when the baby will come. But when the mommy's getting really big...you know it will be any day now. But exactly which day? No one has any clue.
K, fair enough.
We know how all will end. Scientists tell us that the universe is expanding, and everything in it is growing farther and farther apart. As it does so, it grows colder and colder, and its energy is used up. Eventually all the stars will burn out and all matter will collapse into dead stars and black holes. There will be no light at all; there will be no heat; there will be no life; only the corpses of dead stars and galaxies, ever expanding into the endless darkness and the cold recesses of space; a universe in ruins. The entire universe marches irreversibly toward its grave. So not only is the life of each individual person doomed; the entire human race is doomed. The universe is plunging toward inevitable extinction—death is written throughout its structure. There is no escape. There is no hope.
Well, it depends upon which scientists you listen to. What we do know is that the universe appears to be expanding, at this point in time. There are, however, otehr ways of explaining this observed expansion that don't require the universe actually expanding (one is that "time" is leaving the universe, so that things occur more slowly than they used to. This could explain the red shift we observe.
However, I think the more interesting theory I've red regards what happens at the end of the scenario you listed above. Everything could indeed keep expanding, but at some point, when matter is spread out enough, that matter basically goes through a "big bang," and creating another universe. Someone on these boards remembers the name of this theory, but I can't.
So ya, you could be right, and scientists who purport that could be right, but it hasn't quite been verified enough to claim that this end is what we know will occur. We've been observing, scientifically, the sky for only like 500 years, which is basically nothing compared to the universe. There are more than likely aspects of the cosmos we know nothing about, becuase those events simply haven't happened and allowed us to observe them.