IMHO the prime use case for all these WASM stuff is going to be platform independence. Web browsers are not that interesting because for regular use they already have ballooning resource use issues and making web apps even more resource intensive is not exactly inspiring, HOWEVER the web technologies are the only true multi-platform solution we have and it makes sense to use it to make everything with it and everything instantly becomes multi-platform.

What I suspect may happen is, the rise of web browsers of a 3rd kind where these are not really for browsing the web but running code written for native domains. So instead of browsing web of linked text, we can have a web of algorithms to process data and requests.