But at least we won't be worrying about fallig off the edge of the solar system. :) No we can't just sail to distant stars, but at least to ones not too far away, we can at least envision the technology to enable us to get there. Lots of different technologies in fact. Bussard ramjet is my favorite, but there are many others. Generation ships if we must, but I suspect before doing something like that, we'd send probes first, which would also take generations to get there. Speed of light is the only real limitation set by physics, but it's a big one given the size of the galaxy, let alone the universe.