The Future of the Open Web

"...open web, in the form we know it now, is under threat..." - so there is a chance that I might not be forced to use or transpile to JavaScript/HTML/CSS in future?

To me "open" means I can use a language of my choice. Android, iOS and WP are all very open in this respect. I am not forced to transpile to Java, ObjC or C# respectively while others are using them directly.