Areas in which I think big battles for the public's opinions and dollars will happen:
The legality of mind altering substances, particularly psychedelics and medical marijuana.
Our food choices and sources. As we have more mouths to feed our eating habits may have to change. Not to mention ethics, but that's more of a personal interest.
Safety and understanding of artificial intelligence and the singularity.
Research into aging and more widely a move away from the cult of youth.
So get pumped marketers and PR practitioners; FMCGs, CSDs and autos are just a place to hone your skills!