The missing point is that other languages have bigger/more specialized ecosystems. For the networking effect to exist, your network doesn't needs to be just bi

The missing point is that other languages have bigger/more specialized ecosystems. For the networking effect to exist, your network doesn't needs to be just big. But it needs to be bigger than the rest. That's why people don't leave Facebook. Java, C#, C++, Python have big ecosystems with specialized libraries for enterprise applications, performance, data analytics, etc. If any, Javascript is already decreasing its influence in the web. Unity3D works with C# and it is removing support for its own version of Javascript. Or your choice may be Unreal Engine and C++. Or you can use Emscripten with C++ to build your own solution. JavaScript is a language with a lot of problems. The final blow is going to be WebAssembly, as it will open direct web development to all other languages. JavaScript will stay with us for long. But I don't think that is reaching its peak right now.