I think everything changes once we finally understand gravity, time, space, dimensionality, and how all of these things are related.
Oh and wait until CRISPR becomes mainstream and accessible.
As for time travel and teleportation, I can see it happening. The reasons we think that they aren’t possible is because we’re limited by assumptions of how we believe time and space operate and dimensionality operate. When we think about teleportation for instance, we assume it must involve deconstructing matter and reconstructing the same matter exactly in a different location. Or a second assumption we make is that space isn’t malleable. But what if space is malleable? Picture a flat piece of paper. Put a dime on one end, to get to the other side of the paper without lifting off the surface the dime has to traverse the length of the paper right? Well what if we fold the paper such that one end connects to the other end, eliminating any physical distance in between, push the dime across the now folded paper and then unfold the paper? The dime has essentially teleported across the paper. This idea in real time would require a manipulation of time/space and dimensionality that we haven’t yet achieved but if we were to achieve it then teleportation becomes possible. Alternatively, what if we learn to create wormholes through space that we can then move through?
Anyway, these ideas aren’t mine. People who are smarter than me think about these things in these ways all the time. I think the point is that innovation requires letting go of our assumptions about the ways things work.
As for time travel, a thing I’ve been thinking about lately is this: if time and space are directly relational, which to my understanding is what e=MC squared is all about, then given that space is at minimum three dimensional, then perhaps time is also three dimensional and not planar or linear as we perceive it to be. If we are to think of time as multi-dimensional rather then linear than it stands to reason that there are ways to experience, manipulate, and traverse time that are possible albeit incomprehensible to our current understanding of physics. Anyway, this isn’t a fully fleshed out thought, but it’s something I’ve been thinking about…
All this to say, somewhere in the world a bunch of folks are currently working on dismantling an assumption/belief we have about how the world operates. A couple hundred years ago, if you said we could transfer information and energy through invisible waves sent across the world instantaneously they’d say you were nuts!