For 5 years we've been hearing about how great they are, except nobody is really using them.
So now, it's 'the next thing' that will make it great? Except that next thing isn't there, not agreed upon or implemented, we don't know so many things about it?
Like I say, this is textbook example of tech-hype for things probably not as valuable as they appear.
If (huge if) WASI were 'great, functional, widespread, smoothly integrated' - I do agree there's more potential. But that this will really happen is questionable, and that even if it does happen, it will be valuable, is questionable.