It simply sounds like there isn't much demand for Swift from the Open Source community. Apple certainly makes a big push for it internally, but outside their platform, Swift doesn't have much momentum.
If Apple wants people to use Swift like a first-class runtime, they should stop treating third-parties like second-class citizens. They have $200 billion dollars in cold, hard cash - surely some of it could go towards the selfless development of a universal future computing platform, right?