I'm not buying that we won't. If you showed people from 1,000 years ago what we have today, they would find it indistinguishable from magic. You can argue that "it violates the laws of physics" or whatever, but that's without taking into consideration this all from what we know now. What we know 1,000 years in the future could be light years ahead (pardon the pun) of what we know now. I am almost 100% sure we won't live to see FTL speed travel ourselves. But this is about the future of humanity, not just us. Technology is also accelerating extremely fast in this information age. Again, I don't think it will happen in our lifetimes. But so many things that are possible now were thoroughly impossible even as recent as 100 years ago.