I thought the temples in Tears of the Kingdom were a step back in the right direction, at least. Visually distinct, unique bosses, nice stuff. If you think of each companion as that dungeon's "item" and the point of the dungeon's item is basically to open new paths through the dungeon, it's pretty much exactly what people were asking for after BotW.
In a game where you can do or design pretty much anything, though, what else could a dungeon item be other than a glorified key? It's a little boring.
I dunno. It's tricky. They could keep an open world and scale back the player's freedom a bit, but then would people complain about that? That's rhetorical they absolutely would.
Open world isn't going away I don't think, they sold far too many copies of these two games to walk away from that. Gimme more dungeons at least, I love dungeons.