In our case we use the same library code on iOS, Android, Windows and in the browser to do computationally expensive operations.
Also, to dismiss productivity apps such as PS and CAD as unimportant is kind of crazy. Huge business model change? They are still an enormous part of the software industry and the browser a great platform for distribution for many cases. Performance and code secrecy being two barriers that WASM solves for them.
Imagine if every AAA game had a web demo?
Imagine real support for Peer to Peer video that worked in several browsers and platforms?
What could editors in browsers be? Not just text, but any kind of office suite that exists on the local
Anything requiring a 3d canvas that was limited by javascript's speed.
Is it? Since Adobe switched to the subscription model and the "Adobe Creative Cloud" I'd say they would be quite happy if that infrastructure would be good enough to run their very big application suite(s). Not to mention the savings of not having to support two major platforms (and several OS versions for each) - even realizing them only partially would be big. Of course, given the size of their product I'd say there is little use in talking about this at this point, the web platform would have to mature a lot more first.