there may or may not be 'super science'. we cant live on this presumption. what we know today fits pretty close to our observations though not perfectly.
We may NEVER have a clear understanding of how everything works because there may be some aspect that we dont have the IQ, and possibly never will, to understand.
"we cannot rule out entirely the possibility of unimaginable space and time travel mechanisms."
we can within our science. until our science allows for such things we can consider them as a society, impossible. scientist should of course try to push the limits of our knowledge but any other assumptions are just fantasy.
Someday we could find that dark matter and dark energy are truly real and not a side effect of something else and that in fact they are usable for space travel or communications or power etc etc. What a great day that *could* be.
Someday we might find that string theory is just a side effect of something even more fundamental and that all of our observations of the universe have been a simple perspective on the truth.
but today, ~186kmps is the speed limit, going fast takes more energy that we can produce, and intelligent life is likely to be just as isolated as we are. Though they (smart aliens) are very likely to exist statistically, we don't know.
Also, we continue to become MORE reliant on radio waves and less so on physical wiring. Fiber optics become a backbone but wireless communication is key to advancement. There may be a shift in the data being sent from analog tv to digital data communications, but we are still sending the signals out and will likely send more and more for the foreseeable future.