Every generation of people has its dooms day believe the world will not exist in 100 years.
And many generations believe the future will be full of flying cars and star trek crap.
In 50 years the world will have very little change, no more bombs will drop then in the past 100 years, and i highly doubt that any nuclear or bigger bombs will be used in acts of war or terrorism.
In 100 years, you'll notice some change, there will have to be some completely new ways of life. However i doubt you'll see more then a few more trips to the moon and mars. However i think we will have finally made it to mars in that time , with some sorts of space colony setup on the moon.
In 150 years , it will again be about the same , average age of people will go from about 75 to 100 , there will be a even clearer difference between rich and poor. Cities will be much larger and taller, which will give way to public transportation that either runs up the side of buildings or be using some sorts of flying car by then, however it will not be something everyone can owe at the time.
200 years , public flying cars , another war based off energy demand , completion of what we would call the first star ship , will not work very well at first.
300 years , that ship will finally work better, but still only limited to the first few planets in the solar system. However pointless it will be.
500 years, first contact with aliens( if they do exist) in which the world will jump in tech at a very fast rate
550 , star trek era , but will also have a large group of terrorist types in poorer countries.