Here are some ideas on how I see the next hundred years.
THE END OF GAS
There will be no more gasoline internal combustion engines. A simple and wasteless fuel will take over. Powerlines will not be necessary anymore. You will have your own power station at home. Cars won't need refueling. The price of traveling and transport will decrease dramatically so people will mix a lot with diseases spreading worlwide and goods being produced anywhere on earth.
AUTOMATION AND THE EXPIRATION OF DEMOCRACY
Automation and robotics are a current revolution. The world will be very different in some 30 years due to the economic shift of a majority of people not working but plenty of goods being produced by machines. Maybe there will be less democracy because governments will rule the economy in order to distribute the welfare generated by self-driven machines. This automated society will behave very differently than we currently do. Maybe poor countries will stop working at all and accommodate to receive full help from the robotised rich world; therefore the gap between developed countries and the third world is going to magnify.
PLENTY OF WATER AND FOOD
I guess there will be an important discovery on how to process salt water from the sea into drinking liquid on a very cheap way. Biotechnology will increase productivity at the top and instead of farms, food will be harvested in many floors(*) buildings inside cities (levitating towns).
Water purifying technique.
Water purifying technique.
THE OPEN SOURCE PARADISE
At some point, when abundance in rich countries assures all life conditions for everybody, technology and science will be released by companies and governments or at least there will be a great share of knowlegde-exchange because current rules of competition are not going to be a need to survive. There will be no more struggle to overcome the other one, so knowlegde-secrets will not be an advantage anymore. As a result from this, human evolution is going to accelerate and more advancements and discoveries will take place. Link: Open Source Initiative.
I think movies are going to be developed entirely by software, even from the script. So very few people will be in charge barely on the most refined work or minor shifts. But since nobody wants imaginary artists -people want real blood- there will be true people holographed in files that will be used for making films. These persons are going to true-film the dangerous scenes, or at least pretend they are. They will be forced to lead lives that resemble their movie characters and maybe even participate in dangerous situations in real life, or fake them. Maybe some of this is already happening, I am not too much a movies man.
FLIGHT AND LEVITATION
My last guessed revolution has to do with flight or levitation. I think there will be a major breakthrough on how to keep things floating in the air or escaping the gravity attraction. So flying will not require wings and maybe there will be floating cities. Perhaps space flight will be easy and humanity will settle on the moon, mars and other worlds, creating new countries and political problems.
Biotechnology, genetical engineering, nanotechnology and artificial intelligence will complete this new world that comes.
WORKERS OF THE FUTURE
I think there will always be jobs for the less educated but very little. Most of the workers in this new world will be scientists, philosophers, inventors, entrepreneurs, artists, entertainers, judges, managers, social carers, teachers, motivational trainers, law enforcement, planners, politicians, religious leaders and everything related to automation that cannot be performed by machines.
(*) I had used the word "stories" but I think it is wrong. My Englis is not really good.