Well developing something is never out of the question. I think airplanes are a good example, developed in 1903, the wright flyer flew at 35mph, and for about between 4-15 seconds. In less than 50 years (45 to be exact), we were able to fly faster than sound in the Bell X1 and could do it at speeds around 1,000mph. Who would have guessed? Probably no one.
Given 45 years from now, I think it is perfectly reasonable to be able to fly to another planet.
Certainly the Wright brothers never would've guessed. In the 100 (nearly) years since the Wright bros. first flight, we've come as far as travelling to the moon and beyond (unmanned craft)
In another 50 or so years, given how the first 100 years of flight have gone, I think it's very reaonable to assume that newer methods of propulsion and flight will be developed, paving the way for deeper ventures into space. Eventually (probably not in my lifetime) there will be manned missions to Mars, and if we survive long enough, beyond our solar system. It's only a matter of time before somebody says we can do this, and we will.