The problem is in trying to envision a rocket ship capable of making that trip or an individual being able to withstand the trip. There are many many obstacles to overcome. The theory is solid, but it's impractical to the point that it will pretty much always just be a theory.
That's what was once said about Goddard's rockets, traveling faster than the speed of sound, hitting a ship a torpedo, circumventing the globe, wireless phones, motion pictures, going to the moon,...etc. All nice theories but impractical to the point that it will pretty much always just be a theory. While I am not predicting we see this implemented in my lifetime, I won't bet against 2200 technology taking the same type of jump that we have seen since 1800.