Turns out DARPA is already working on the problem!  AI to detect and spoof AI - machines fighting machines.  They fight for us, they fight against us.  Very matrix-esque. 
https://www.foxnews.com/tech/pentagon-approaches-massive-new-ai-machine-learning-breakthrough

What does it all mean?  Well, I think it means we will be living in a future where multi level verification will be the norm.  Use of encryption will be much greater, and we'll sure need to take more things with a grain of salt.  It means we're is a gold rush to gather every bit of data about people - not just their online presence.  All of this data is what will drive AI to be able to make the fake videos, make the fake phone calls, all to spoof humans.  It means we should be regulating this stuff now, which Microsoft (and others) are already doing.
https://blogs.microsoft.com/on-the-issues/2018/07/13/facial-recognition-technology-the-need-for-public-regulation-and-corporate-responsibility/