Reitter: Answering the question: "How do I develop an app for GNOME?"

The people that supported the Gnome bindings for various languages will continue to support them as they see fit. Nothing has changed. People programming 'system libraries' (ie: anything meant to be used by multiple programs) will want to continue to program in C.

They really want to make one a first class 'this is what you use' language for Gnome so they can concentrate on improving the stuff that matters... development tools, test cases, documentation, etc etc.

Javascript is just about the most commonly used and understood programming language on Earth right now. GJS is based on SeaMonkey so that it's fast, well supported, mature, and modern garbage collected language, and other happy stuff. Apparently the bindings are good even though it's relatively new for Gnome. Makes sense to pick it despite the natural snobbery you see from language lawyers you'd expect to see. :P