I think you're right. Like the giant one in Musashi-Koyama is thriving at the start but dead at the end. The one in Musashi-Shinjou is really dead. So is the Kyoto Sanjo Shotengai. There's no "gentrification". There's just no customers.

That said, I really wish some breakout architect would find a way to design a new building with space for more small shops that became a hit design. And then in my dream other architects would start copying. They built Shibuya Cast. There used to be 8-12 indie stores there. Now there's 3 chain stores. I think Sakara Stage might have done a better job there. I'm not sure but I think if I count the stores/restaurants it displaced there might be more now then before. Though I expect rent is way too high.

Some places, like Toranomon Hills have the indoor restaurant yokochou type areas though I'm sure they are too expensive. Shibuya Sakura Stage also has one. Neither get that feeling like say, Akabane's bar area though. Or Nakano or Koenji. I hope Nakano is not going to lose theirs with all the construction. Shibuya though is going to lose a bunch more. A 30+ story building is under construction on Dogenzaka next to Mark City. Another is 30+ story is going on Miyamasa-Zaka between Meiji-Dori and Aoyama Dori where the post office is. There's a bunch super indie of restaurants there because the rent is cheap given the buildings are old. But maybe it will be designed like Sakura Stage to support more. I can cross my fingers.

There's a 30+ story building going in where the Tokyu Honten was but given that was just a department store the new building will have more shops than the department store had, depending on how you count.

There's yet another 30+ story building going in behind Hikarie. I'm not sure there's anything there it's displacing though. I mean, it is displacing stuff but nothing I've ever gone to, unlike some of the others.