Oh, I forgot in 2050 NASA will be on Mars. And war will be impossible because of lasers, which would knock down any approaching missile.
The first nano assembler would be built before 2050. That's why I said, the best of human achievement is yet to come. Humans have not reached there limits of growth, and we will continue to grow into space.
New technology always changed human lives, just look at the computer, the computer changed our daily lives, everyone communicates, acquires knowledge, etc. All through this computer.
In 2050 imagine the kind of technology we will have, life extension, supercomputers, Web 3.0, hand-held laser weapons, space tourism, space hotels?, etc.