Not really convinced by MUSIC like myself? Not a problem, we have one major announcement for the developer sleeping in you: Swift 2! Moreover, Swift will be open source! Even better! Swift 2 will be open source, and available on Linux! Time for you to start looking at it, no?
<personal ad>SiftVOTable is an ongoing dev of yours truly to have a VOTable-parser in Swift, cool, isn't it?</personal ad>
Now, the key thing is to know whether the release of Swift on Linux will also include the famous "Foundation" library. The blog post above only says it will include "standard libraries". But Swift, like Objective-C, isn't very powerful without the famous Apple libraries Cocoa and CocoaTouch.
At the foundation of Cocoa(Touch), there is Foundation. And that would be a minimum to start writing server apps with Swift. I may need to reconsider what I am writing for iObserve 2...
Do not hesitate to leave comments about it below!