The Voyager project itself has long ended and it's just cute to keep monitoring it and getting data from it. If nothing else, it serves well as a perpetual PR vehicle for NASA. The core of the project I would not say represents long-term thinking of NASA or civilization. I'm not convinced that we're biologically wired to think long-term. It's extremely rare when someone pops up, and they usually end up becoming extremely impactful in society (Lincoln; Jobs; Elon)