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TwistedTwigleg GDScript is not going anywhere because it offers a superior Godot development experience.
This. It is just too good integrated into the engine. As a scripting language for Godot it is second to none. And C++ is the language when it gets deeper into the engine.
As a Linux user (not Ubuntu), I have no need for .NET. There are superior tools for development in this ecosystem, though they may need some more effort to learn and use. For games as well as systems programming, I'd rather see the upcoming Rust as an alternative. It is in the same performance ballpark as C++ and C, but avoids a whole class of possible programming errors. Though it can drive me nuts with its "You can't do it so I won't let you" attitude :-/.
I believe there are Rust bindings for Godot GDNative, and possibly the new GDExtensions.
TwistedTwigleg there are plans to make it semi-compiled
That would be cool :-)