Since we have a probe in interstellar space (past the heliosphere) right now, I'd say that your statement might be bound by the facts, and a limited understanding of the current acceleration of technology.
No one is going to jump on an interstellar liner next year, but to say that it is an impossible fantasy is akin to:
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
-- Lee deForest, American radio pioneer and inventor of the vacuum tube, 1957
/johnny
E=MC2
To a layman what this means Energy (E) = Mass(M) X Speed of Light squared, so it would an infinite amount of energy to get anything with any mass at all (meaning everything that exists from space ships to mole crap) going anywhere near the speed of light. Get it? INFINITE Energy (there is no such thing, never will or can be such a thing).
With the growing interest in private space, I suspect the speed of technological advancement will increase exponentially.