I'm liking the standardization in web. I think it's possible that you'll see something in web like you see with C/C++. D is better than C++, but it isn't compelling enough to jump. You need a very compelling set of features to leave the very comfortable, though dangerous, home of C/C++ for the domain that it excels in. With web, you'll need compelling features to leave the comfortable home of Typescript + React.
You're right about D, but Rust is drawing some people away from C and C++. Something may emerge that will do the same on the JS front-end. In fact, I'd say that the TypeScript/React combo is more susceptible to being replaced than C and C++ are. There are many large C/C++ codebases that represent many man-years of work and won't be rewritten or thrown away any time soon. JS front-ends don't have that kind of longevity. Think about how many web startups just fizzle out, and their code just goes away.
