The answer to this is both "never gonna happen" and "you already can."
You already can ship a React app in pure JS and even import modules via ESM in the browser from CDN. Performance will suck but you can.
You'll never be able to actually have a complex web app that you can just drag into the browser. As the base API expands, so do the ambitions.
Heck we've had PHP 4 years after HTML just to fill in some blanks, people will always want more than static code.
The answer to this is both "never gonna happen" and "you already can."
You already can ship a React app in pure JS and even import modules via ESM in the browser from CDN. Performance will suck but you can.
You'll never be able to actually have a complex web app that you can just drag into the browser. As the base API expands, so do the ambitions.
Heck we've had PHP 4 years after HTML just to fill in some blanks, people will always want more than static code.