We already live in that world, and the sky hasn't fallen so far. Even in the worst case scenario, the world isn't going to be as horrifying as the alternative,

We already live in that world, and the sky hasn't fallen so far. Even in the worst case scenario, the world isn't going to be as horrifying as the alternative, because people react to the proliferation of scams, they will not keep falling for fake impersonation for the 10000th time a row. In this scenario, we simply will stop taking factual-looking images at their word in the same way how you don't take any piece of writing on the internet as factual, verifiable truth. Journalism will rely on a person vouching for their images with their reputation, and images with unknown sources will be looked at with suspicion. I am not willing to pay the price of sending every bit I create to some megacorporation's server or stamp it with my only identity so the computer can tell me what's AI and what isn't. Especially not while the average quality settles into an uncanny valley that's often discernible with the naked eye, both for text and images.