There are only 4 major scenarios what can happen on the long run.
1. Mankind is destroyed by their own weapons (nukes, biological weapons, chemical weapons or classic warfare to the end)
2. Mankind stays how it is for a long time so the evolution becomes visible and entire species splits on many species because of that. Then those species evolve until you can't even see human form in them or they destroy each other.
3. Mankind is destroyed by natural forces. Forces like viruses, crazy level of tectonic activity, asteroid/comet impact, black hole or neutron stars collision and ÖÖ.
4. Mankind starts to change itself and its environment so that it could expand through out the universe.
Since things you have left behind canít survive in definitely your life and your achievements donít mean much on the long run.
...things canít stay as they are because that will kill any chances of survival on the long run. ...we will get huge amount of species that will probably fight wars between each other. ...donít see a purpose in insisting on human values.