So how can we make this a cause area that people will take seriously and try to put in effort to bring about, as they already do with other longtermist cause areas?
In my view: you don’t make it a separate cause area. Even if you think this is the most important thing, your optimal strategy would be working on prerequisites like the survival of the human species and better spaceflight capabilities. I don’t see any clear advantage for your goals to researching any hedonium-specific topics centuries to millennia before you’d expect creating it to become technologically feasible.
In my view: you don’t make it a separate cause area. Even if you think this is the most important thing, your optimal strategy would be working on prerequisites like the survival of the human species and better spaceflight capabilities. I don’t see any clear advantage for your goals to researching any hedonium-specific topics centuries to millennia before you’d expect creating it to become technologically feasible.