However I find unsetting how Eich ends up defending WASM by hoping it's not too successful (used only in some hot pathes, not full blob apps.) That's frankly quite ridiculous: I predict a full apps adoption pretty soon. Just wait for more mainstream languages to support it.
The open web in the sense the OP meant has been dead for a while, WASM is just another tombstone.
WASM is not a replacement for javascript, and it's not trying to be. You won't be writing entire applications in whatever you compile to WASM, it's not how it's designed, it's not how it's meant to run, and it's worse in most ways than just compiling your favorite language to javascript (which has been possible for a long time now, but nobody uses it because it's such a leaky abstraction).
The open web is flourishing more than ever, and WASM is keeping that alive with it's "text" mode.
I can also run objdump against Microsoft Office. Does it make it open?