I gave the political solution in post #14. You just have to get laws passed closing the market to amateurs. That is how medicine, law, dentistry etc work.
And before you scoff, note that hairdressing is a closed market in most US states. No kidding, doing hairstyling without credentials is illegal in a lot of places.
Ah, I see. So you want to legislate art.
That's insane, but okay.
How do you propose doing that?
And, please, keep in mind that photography is hardly the life-impacting endeavor that things like medicine, dental work or the law can be. Even hairstyling is something which should be regulated. After all, every hair stylist I've ever met uses implements which can cause severe injury to a client.
What injury is caused by poor photographs?
No, "licensing" something which is, at its core, an art form is patently ridiculous...