The only way I can see p-zombieness affecting our world is if
a) we decide we are ethically bound to make epiphenomenal consciousnesses happier, better, whatever;
b) our amazing grasp of physics and how the universe exists leads our priors to indicate that even though it’s impossible to ever detect them, epiphenomenal consciousnesses are likely to exist; and
c) it turns out doing this rather than that gives the epiphenomenal consciousnesses enough utility that it is ethical to help them out.
The only way I can see p-zombieness affecting our world is if
a) we decide we are ethically bound to make epiphenomenal consciousnesses happier, better, whatever; b) our amazing grasp of physics and how the universe exists leads our priors to indicate that even though it’s impossible to ever detect them, epiphenomenal consciousnesses are likely to exist; and c) it turns out doing this rather than that gives the epiphenomenal consciousnesses enough utility that it is ethical to help them out.