Dreams associated with "the future" (or science fiction and time travel) can be associated with a somewhat higher plane than you're used to projecting. Higher energy is symbolized in "more advanced." What you might have responded to is a feeling of unity (expressing itself in the uniformity) that you can encounter on these planes, and the radiant nature of the Source (strong solar light).

This may initially not to seem to match your dream but what happens when any experience with the energy of the planes is had that there is a processing and interpretation through all the filters you possess as a person. This especially true for opinions, judgments, and evaluations you had in your own mental voice about the environment. So this is more a look into yourself and how you define yourself and your individuality, and how this definition of yourself reacts to your environment.

For example you mentioned the layer of ozone protecting us. If you take the sun for the Source interacting with us, we do indeed have "protection" from too much exposure to Source on the lower planes, especially the physical and astral. These planes are in a sense outer planes, more distant from Source. As you get closer you are "less protected" from Source with all effects this brings. So the "future" (a less distant plane from Source) has less of a layer to "protect" you from the Source's light.

This might seem contradictory in that many people define the Source as ultimately good and beneficial but what the light of Source does is that it strips away all that is false and resistant, so people experience discomfort from an equivalent to sunburn maybe up to agony, depending on how close they came to Source and how much their capacity they had to do so, and especially how much identified they were with those parts of themselves. We sometimes identify with our body, emotions, habits, beliefs or similar concepts quite strongly. This strong identification comes under duress closer to Source. You can picture such a relationship as the ozone layer and bright sunlight on a future Earth.

Similar the sterile cleanliness could be a symbol for less human emotional clutter in this energetic environment. If you've ever been to the lower astral you might have seen some really dingy neighborhoods in comparison. (Or worse - it depends on the experiencer. I saw concrete urban sprawl with bouncers in front of night clubs. )

An elevator is by the way a typical sign for moving between sub-planes at the very least or maybe even planes. Escalators are typical for moving sub-planes as well. These ways of moving represent an almost effortless change between planes. In comparison, hiking up a slope would be more demanding, meaning that the plane or sub-plane is harder to reach.

Your dream is very clear, though, and offers good material for interpretation.