I would imagine in ~5 years this will primarily be used in apps for the purpose of vanity clips (ala Snapchat, MASQRD, etc) and otherwise trivialized, as well a

I would imagine in ~5 years this will primarily be used in apps for the purpose of vanity clips (ala Snapchat, MASQRD, etc) and otherwise trivialized, as well as probably some very profound and moving applications (think of a deceased loved one bringing to life heartfelt messages, dissidents using a dictators face to deliver messages to their troops, or even ones we can't begin to fathom until it's so easy that anyone with an iPhone can mask themselves with someone else's picture). All of this, IMHO, will shape our general cynicism and distrust of recorded evidence, which will lead the way to us finding other heuristics to sniff out bs. I think this is an overall net gain, but I do agree, there will be some people who's lives are destroyed by what this enables, which really sucks, to put it lightly. The upside, at least, is that we already have people looking to find ways to deal with this right now.