I think the truth is that not only can’t WASM manipulate the DOM

Not directly no. But it can via JS (without the developer needing to ever touch JS code themselves via auto generated bindings). And this is simply a limitation of the current WASM implementations/standards. I believe there is work on going to get WASM more direct access to the DOM. But really this will just be an efficiency improvement over what is currently possible (which is already possibly to be as fast as pure JS frameworks).

Secondly, if you want to use WASM from another programming language, that is just another language you need to learn on top of javascript, because we are not at a stage where we can replace javascript (because of the DOM).

This is not quite true. Yes we cannot replace JS currently. But you don’t need to learn JS to develop using WASM - there is already enough tooling that can auto generate any JS code needed for you so developers never actually need to learn or touch JS if they don’t want to.

But existing developers that already know JS don’t have a huge reason to learn another language that only have a vastly less mature ecosystem. So the door is currently open for those that don’t enjoy or want to touch JS, but those people will at this point in time be working on other things rather then web apps. So there is not going to be a huge push for moving to a different language with WASM support any time soon. Not to mention that there is only minor benefits to existing applications that make a full rewrite to another language not worth the effort. So people wont be flocking over toward it, but not for the reasons you mentioned.