>>There are no material goods that can justify the material and energetic expense of any interstellar travel.

Material, no. but we know with absolute certainty that Earth will stop being habitable for humans at some point. So assuming any intelligent race, human descendent or otherwise, still exists on this planet, it will have to eventually move. It's just pure luck that we evolved when we did. But there are valid reasons for interstellar travel(other than you know, pure curiosity).

I wouldn't characterize it as "moving". Any excursion outside of the solar system will not be done by anything resembling a modern human, full stop. It may be plausible to send some sort of robot with some sort of nanomachine hoo-hah off in the direction of a nearby star, to seed life there. But no living human will ever leave the heliosphere.