I agree with Mangetout (who woulda thunk?
) that intra-galactic colonization may be too great a technological barrier for the human race to ever overcome. Many people harbor the false belief that after mastering space travel within our solar system, traveling to alien solar systems will be easy and quickly realized. If you compare the distance differential, you should quickly realize that taking that next step will be more difficult by magnitudes of order. I surmise that in 1 million years hence, humans may colonize terra-formed planets within our solar system, and possibly some planets around the most local star systems – if we’re lucky. As for inter-galactic travel/colonization, I believe that may be an insurmountable universal barrier for all life forms for all time.
As I’ve proposed previously, I think that human evolution will stagnate. I also believe that the effects of genetic engineering will be limited even 1 million years into the future - some limits will be biological and some will be self-imposed. Many diseases will become non-existent, a few design improvements will be engineered, some intelligence boosts will be formulated, but all in all, I think that our 1 million year progeny will more recognizable to us than what most of you are positing – slightly more improved than Captain Piccard and his crew. As much as I would like to be an immortal super-sandman, I think we will continue to be mortal, fallible, carbon-based critters for a long time.
Now, think about everything that our descendants will most likely not have in common with us – things and concepts that they will not be able to relate to – and you will be able to see what historical figures may become obsolete. No basketball; no need to remember Michael Jordan. No America; no need to remember Christopher Columbus, Thomas Paine, George Washington, etc. No religion: no need to remember Jesus, Mohammed, Confucius, Buddha. Quantum mechanics deemed outmoded; no need to remember Neils Bohr, Edwin Schrodinger, etc. The list may be very long.
Then you have to consider endeavors and concepts that may not become obsolete, but the people associated with them are non-charismatic and easily forgettable. Crick and Watson: snore. Jonas Salk: boring. Johannes Gutenberg: hand me the No-Doze. This list is also quite long.
Indeed, the folks who will live on in infamy must be associated with ideas and concepts that do not become obsolete (i.e. space travel), and they themselves must be charismatic icons for all ages (even if their charisma was an agenda-based fabrication). Our decedents may name-drop people like Einstein and Newton, but they will do so while zipping around in their space ships named, the USS Armstrong and HMS Gagarin.