The future does exist in thought and as we create our present, we attract towards us and begin to manifest a more probable future.
All that we see and experience on earth must first be created in astral and etheric before it can materialize in our reality.

So, all potential futures are being created and only those that are probable will continue to exist because of the energy of consciousness adding energy to them to become our physical reality eventually.

I am sure that there is more to it than that, but I am quite confident that the future exists, perhaps only in thought but there may also be parts of the future that are created as thoughts and placed somewhere by the archangels so that it is available for people to pick up in their consciousness and start to think about.

Also, people (or aliens I guess) that live in the 4th dimension or wherever, can also create things and then once they are perfected, put that creation and thought into the collective consciousness and then someone on earth can pick up that thought and start to manifest it into their reality by thinking about it and working on it and slowly bringing it into reality.

So, it is certainly more difficult to think that our future is already known for 30 to 50 or more years out but I think that when it is that far out, it can be changed. Maybe not completely changed but altered enough that it would look like the events seen in the future do not happen because of some change now that alters the future just enough to avoid some outcome.

I know that the GWB have said that the pole shift and the flooding of countries and such will not happen now because just enough of a change happened to alter the course of our reality that it will not happen now.
Also, they stated that WW3 will not happen now, so it is possible for the future to be changed but also, obviously, some things have happened that were seen by Remote Viewers, so not everything can be changed.