Let's not forget that people said the sound barrier could never be broken, too.
Just because we figure something is impossible, very improbable, or highly unlikely because of our current understanding of the universe and how we think it works doesn't mean that is actually the case.
Lately I have observed many people of various backgrounds (writers, scientists, etc) seeming to disparage or denounce new ideas or theories or whathaveyou simply because our reality doesn't allow for it to be instantly true. Hyperspace and FTL travel is a great example. Just because we can't do it now doesn't mean we never will. If we assume for the sake of argument there is life elsewhere in the galaxy, it doesn't have to follow at all that just because we can't travel beyond our solar system that they must not be able to, either.
I agree that a certain degree of doubt is good to keep people grounded, but it seems more and more that people aren't even willing to give things any consideration right from the start. It's just, Nope, that's no good, next!
I wonder why it is that these people I've observed allow their imaginations/dreams/etc to be so limited by our reality. Why does humanity have to be capable of something right now or know "for certain" that something is possible in order for it to be acceptable?
For example, someone once argued with me that if I was going to have aliens in my story, they must be alien as to be incomprehensible to my human characters and therefore incomprehensible to my readers. I know a lot of other writers feel this way also. I don't agree with that view. I think this falls in the same vein as what I mentioned above. Why do people give us (meaning humans) so little credit? When Earth was still being explored and different cultures came into contact with one another for the first time, they were certainly different and probably incomprehensible to each other, too, but we still figured each other out, given time. Why then should we assume we'd be incapable of figuring out aliens? It might take longer and require more effort, but I don't think it needs to be impossible.
Just my $.02.
Anyway, that's probably a little off-topic. But the idea of hyperspace or any other mode of travelling through space like that possibly being feasible is certainly exciting. The avenues it could open up...! Even if the ideas they have prove fruitless at this time, perhaps they'll lead to other lines of discovery instead. ^^