There are only two possible outcomes for us: we will either die out as a species or survive. Given the tiny amount of time we have existed as a species, and the unpredictability of the universe, I would guess that we will eventually cease to exist, either by natural forces or by taking care of it ourselves. This could happen in a thousand years, or a million years. In the short time we will survive as a technoevolution of ourselves, enhancing our features and capabilities artificially to the point where we no longer look like the humans of today. Where we take it from there is pure imagination.