People were able to make very realistic fakes of anything 10-20 years ago, using basic tools. Just ask the UFO nuts or the NSFW media enthusiasts. And like what you mentioned, staged scenes have become somewhat common as well, including before the internet.

We can expect more of the same. Random unverified photo and video should not be trusted, not in 2005, not in 2015, and not today.

I believe that this "everything was fine but it's going to get really bad" narrative is just yet another attempt at regulatory capture, to outlaw open-source AI. This entire fake bridge collapse might very well be a false flag to scare senile regulators.