Clearly big changes are ahead of us. Mostly those changes will be the result of our inability to adapt to climate change, growing populations, and the exhaustion of our resources. We can look at our current handling of these issues and predict the long term trends that we are creating by our inaction in addressing our problems.
We look at the 'progress' humans have made on the planet and believe that it will continue forever. Actually, we will look back at this exceptional time when things lined up just right for the industrial/ technical period that we enjoy today. We had a favorable climate for human development and we had a planet full of raw materials.
A realistic examination should show us what to expect in the future. For one thing, we are depleting certain resources that have been essential for the development of the highly technical modern world of which we have become dependent. It seems certain that some other discoveries of various mineral deposits will replace some that which becomes exhausted. And new technical advances will stretch the use of some of those resources as they become more and more limited. But, an honest assessment would reveal that we will have to do without some resources that will not be replaced by either new discoveries or new technical advances.
As we drift farther and farther into the future, this will become more and more evident. We will have to do with less and less of certain natural resources. This will translate itself into doing with fewer and fewer of the items that are manufactured out of the those dwindling resources. Also we will be lacking the energy sources for the huge manufacturing processes that dominate in today's world.
Ultimately, assuming humans continue into the distant future, we will simply run out of some things. Those humans living at that time will become more and more dependent on local supplies of the necessities of life. Food will not be grown with massive injections of chemicals and then transported great distances. Food will become local. Those items grown will only be the ones adapted to the local climate and soil conditions. It will be grown by those who live in the immediate region. That effort to grow food will consume more and more of human time and energy.
It is possible to envision people only able to live at the two poles of the planet due to climate conditions and atmospherical conditions. They will be growing and eating what can be grown in those locations.
Even then, we can foresee that some people will be scavenging items left over from the manufacturing age in attempts to fashion weapons. But there won't be enough energy to mount the types of wars of past human history.
Our current enjoyment of manufacturing and technical marvels will prove to be an abnormality in human history. Future humans will be dedicated to basic survival issues such as food and shelter. All things considered, our future looks just like our past.