I completely agree. I want to be able to write the core of an application once, and then add on a UI for every platform I deploy it on (Windows, OS X, Linux, iOS, Android, etc.). Currently, the only real options for doing this are C/C++, and that's just no fun to do.

I'd love to have a higher level like Swift that can be easily ported between platforms and connected to whatever development language/environment that is commonly used on that platform.

I'm hoping that open sourcing Swift will allow something like this to happen. It seems like Microsoft is already making moves toward making Swift interoperable with .NET as a way of making it easier iOS developers to release Windows phone apps, so I'm optimistic.

You can do this with rust and go already by cross compiling which they both make easier than C++ makes it.

> It could become a serious Javascript competitor due to its elegant syntax, the type safety and speed

Particularly in combination with Web Assembly. I wouldn't be surprised if there is already an LLVM bitcode > WASL compiler in progress.