When you've read science fiction your whole life, as I have, 40 light years seems like nothing; just down the street, space-wise. But in the actual universe limited by the speed of light and an 80-year human lifespan, I don't see humans ever actually sending a probe there, let alone visiting in person. The travel time, even if we had some propulsion system that could build up a velocity of some appreciable percentage of light speed, would just take too long. We need to either find some way around the light speed barrier, or greatly extend the human lifespan, before exploring even 40 light years away can become a possibility.