Why can't anything go faster than the speed of light?

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Yes.

Frenchman is running together two different topics: what nature allows, and what intelligent creatures can do with what nature allows.

If it aint possible, it aint possible even if smart aliens work on it for a million years. If worm holes dont exist than even the smartest aliens cant exploit them, and neither could our own descendants in any future.

But yes- its quite possilbe that Einstein and Quantum physics will both be over thrown in the future. So down the road we might get new ideas for what nature allows. But for now those two theories are the best game in town to extrapolate to the future. Though you can never say never you can say "not likely" in the near future.

you're predicting interstellar space travel by human astronauts in 2050, or 2060? Thats only 45 years away. Forty five years ago we first landed humans on the Moon. That still as far as we have sent human travelers. We just now flew a robot flyer past Pluto at the edge of the Solar System. The Moon is one and half "light seconds" from the Earth. Earth is eight "light minutes" from the Sun. Pluto is about "five and a half light hours" from the Sun.

you're saying that we are going to vault from sending robots five light hours out to sending humans to the nearest star (four light YEARS away) in less than fifty years. Thats a lot to hope for in fifty years.

Technology changes rather quickly. in the 1930s we using vacuum tubes. Computers took whole floors. In the 1950s their there seven intergrated chips in a radio. Now there are hundreds of intergraded chips in your smartphone. Just imagine what technology will be like in 2050-2060.

Newton discovered the physics that put men on the Moon; he did not create them.

The seven-transistor radio was common in the 1950s, while integrated circuits found the most use in hearing aids.

The laws of physics dictate that even matter teleportation must obey causality. That is, even though the trip might seem instantaneous to the traveler, he or she would still arrive at the destination no quicker than would a photon emitted from the point of departure and traveling through normal timespace.

And while "wormholes" may be predicted by some physical theories, the same maths that predict them also predict their collapse the moment matter transits their event horizons.

The only FTL principle that might eventually be exploited is quantum entanglement; this would be a long shot.

Jules Verne, Paschal Grousset/André Laurie and Konstantin Tsiolkovsky fiction proved to be fact in the 1930s-1940s with the development of the V-2 rocket. Today's fiction will be tomorrow's fact

I think, perhaps that what it comes down to, is that advances in Science seem to come in one of two forms:

- slow, steady advancement that results in what looks like an upheaval in retrospect pop-culture but in fact was not. Relativity and Evolution come to mind.

- serendipitous discovery that changes everything. Röntgen's discovery of X-rays & Becquerel's discovery of radioactivity. Plunkett's teflon. Perkins' synthetic dye. The list goes on. But in each case, the current state of science had to be such that the conditions were ripe and the observer already had a baseline structure in which to place and understand their discovery - or even to recognize that it was a discovery at all.

I think it is safe to say that for either form, FTL travel currently is not at that point.

I like to think about it awesome kind of Cosmological speed limit. You can however go 99.999...% of the speed of light just not 100% of it itself. This is one of my interests.