Assuming that it was really a "drone" and not a bird, trash bag or party balloon as we've seen in the past, what is being done about it besides threaten everyone who has ever piloted a sUAS? Certainly there can't be that many people from that area who own whatever model of UAV they supposedly saw. The pilots saw this as they were coming in for a landing. It couldn't have been very small. Not likely a Spark or little Parrot model. Or was it? Was some kid out there with his home built little FPV racer getting his "yaw on" and decide to pop up into controlled airspace and do a loop around an airliner? Did they spot a Mavic sized sUAS? Maybe a larger, easier to see Phantom? Or Inspire? Was it a Typhoon? Bigger like a Matrice or some big agricultural unit? There's not a lot to go on from the article and I am skeptical of any "drone sightings" because previous reports have destroyed any credibility they might have had. The idiots flying around airliners are going to post about it on social media and brag about it. Investigate them, locate them and Prosecute Them. Don't lump the rest of us responsible pilots in with the morons doing this. This isn't Catholic School where one student screws up so the nuns punish the entire class. I got enough of that mentality as a kid at Holy Ghost elementary and I refuse to be punished for other peoples screw ups today as an adult.
BUT! Re. last statement above. Itseems like it taught you something good. Pity it is not more widespread perhaps.
Hold that last thought, kiddo!
It is easy to blame 'drones' now, but what about the other stuff you mention, like trash bags, birds etc. (which cannot expect to know any different about a/c safety of course), remember when 1947 gave rise to 'flying saucers' and the 70's to 'UFO's'?
Now it's DRONES!
Betting is open on the 'Next Big Thing'! Lol.
However, if it WAS a drone, then I would expect further action from the authorities, but I could not suggest where they would start. So just ban them? Even that won't work against a total idiot with the right equipment. I am sure I would not hand mine over, lol.
And I, personally, think that why we don't see reports of 'conventional' R/C craft in the above situations, is the lack of a camera on them. Nothing to show off or brag about (or post on t'net).
That might be a clue as to
why it happens.
I also saw your other post where you mention transponders. That might yet be the best way if the tech is suitable. But there will be those who will not comply, or have older machines, and / or feel they are responsible enough already.
Maybe mandate they are fitted to new builds of off the shelf drones and core level of self build electronics.
Then all we need (or DJI et al) need to do, is stop these things taking a dislike to where or how they are being flown, and seeking 'pastures new'!!