I blame popular science fiction and pop science, I really do :)
I know we do not know everything, and people can use examples from history to illustrate why we should never say never - but;
As far as I understand these things, the notion of time travel is pretty much impossible, other than the rather mundane observation that we are currently travelling forward through time, an second at a time.
FTL does not seem too likely either. Most speculation revolves around side stepping that limit by use of wormholes etc - but the idea that we could traverse a wormhole is a speculation on a speculation, it seems to me. Personally, I think we are going to have to live with the idea of sub-relatavistic speeds,certainly for the forseeable future.
Immortality - This is not just a question of finding one genetic switch, throwing it and then us all living happily ever after. As a biological machine, we are programmed throughout our whole genetic code for death. From birth, the proteins that form the clear lens of your eye for instance gradually degrade, cross-linking and gradually becoming cloudy and occluded.
Our genetic code is moderated by oncogenes and acted upon by epigenes.Genes rarely work in isolation, so you are talking about whole genetic sequences and complexes. We might be able to live longer, through better diet, less demands on our bodies, better medical interventions, but I seriously doubt we will ever achieve immortality.
And as for teleportation - I actually think this is the least likely - at least for biological materials. Break down the process of what teleportation means for a moment - the usual model is that the body is dissassembled at an atomic level, converted to digital information, held in a buffer, transmitted to the arrival station, then re-assembled, atom for atom, at the other end - instantaneously, with no loss of, for instance, cognitive abilities.
We just cannot even begin to imagine the technology to do this. How do we break down a body at its atomic level? What technology do we employ to scan this? How can we hold the mass of data of trillions of atoms, molecules and cells? What technology is proposed to reassemble at the other end? And how will congition result, since consciousness is an emergent property of biochemistry and electrical activity?
No, I really think that all of these things are likely to remain unfulfilled wishes, plot devices for science fiction, for a very very long time.