These are essential elements of fiction and film - entertainment. "Interstellar" relies on these hopeful 'devices' as plot points and 'scientific' credibility.
Then, there is always reality. We don't like it, we devise our own twists. We are hopeful and have faith that it will all work out, that there is a way. We explain gaps in our understanding with 'something' out there. We just don't accept that there is 'nothing' out there.
In science fiction, HG Wells and Spielberg point out in "War of the Worlds" evolution here, on this planet, has made us what we are. Just as the aliens with their terraforming and space travel couldn't survive here, we couldn't survive there. There will be no Star Trek Class M planets we can flit about looking for a new home.
We are a finite species. The historical record here on earth and our observations of the universe confirm this. If it were even possible to go somewhere else, our time would be limited there, too.
I'm hopeful we have the Spielberg ending of AI in the future, rather than your more likely version of batteries running down, and fade to black.