Comment by hliyan

Once the responsibilities of creating a UI is divvied up between a visual designer and a domain expert, I doubt there is much for a UX designer to do. At least not at each product/application level. Perhaps at an industry level, there may be a need for a small number of these roles to advance the state-of-the-art of human-computer interaction, but it is not a problem that needs to be re-solved at the level of each product. In the 80s and 90s, these roles existed within the operating system companies and they came up with things like scrolling, pull-down menus and tabbed interfaces.