As others have suggested, genuine "drama" is elusive, and especially in the world of sports it can't easily be manufactured. (When announcers try to manufacture it, it usually comes off as "melodrama" - forced and unconvincing.) Koepka played a magnificent round of golf, and if it was all/only about the golf that would've been enough. But for many, it's not only about the golf; and the drama we seek he could not on his own provide -- there's not enough history there, no compelling narrative. (That's not his fault).
If it had been Rory in the lead, they could've spoken about his "steely determination to regain the No 1 world ranking"; if it had been Dustin, the story would be that "no golf course no matter how long can withstand his overpowering game"; if it had been Justin or Rickie, it would've been about "making a case for a Big 5 - the start of a new post-Tiger era in American golf".
The reason many of us like the venerable old courses is that the course itself becomes the drama, or at least serves as the underpinning for that potential drama -- e.g. what Jack did there, or Hogan, or Jones, or Tiger.
I guess it might come down to that: will the USGA decide to focus on the ready-made drama (Merion, Oakmont, Shinny, Pebble), or continue to risk trying to create, from scratch, new drama, at new courses. And as I ask that, I think I know the answer....