Nope, our current science tells us FTL is not only possible, we even know what we need to do in order to it. Now how to actually practically do it, is the only hurdle. Let me illustrate. In the 1950s there was an SF novel. I can't remember the writer, but the novel depicted desktop computers on every desk, sometimes multiple in a home, faster than the fastest computer back then, and to top it off, all the computers were linked together in a world wide network. Sound familiar? You know what the going scientific rate was on the book? It was ridiculous! Computers could NEVER intercommunicate. And Computers would NEVER get smaller, they'd only get BIGGER! Sure as science! Less then twenty years later, the first desktop computers arrived. Another dozen years later and the European universities and soon after American universities got connected in the first global network. Another fifteen years later and the world wide web was born. Another ten years after that, and here we are. THAT is why artificially keeping yourself to what "present day science" tells us is rather, well, ridiculous. What scientists would tell you is impossible today, and won't happen in a million years, might be on your desk no more than a decade later, and your children would laugh the scientists who told you it was so impossible out of the building. The same happened with Jules Verne's envisioning of men landing on the moon. It would never happen! Then it became 1969. Ships traveling under water? Hah! Would never happen! A good rule of thumb is; if Science Fiction shows you something that Science are hard telling you it's impossible; expect it to be true within your lifetime. Higher chance of that occurring than it being actually impossible.