Wait for the next change in laws and business models.
It will go like this:
Smartphone manufacturers, camera makers, app designers will keep the copyrights to any and all pictures taken on their devices...
You read it here first !
I'll be happy to see these big stock agencies go under. In fact, they're more to blame for crapping on the photo market to begin with. What's funny, bargain photo stock agencies freakout when they actually have to deal with higher priced, more exclusive imagery, because they have no clue how to price images any higher than a few dollars. They screw the market and photographers alike.