C# devs like myself are interested in Xamarin are interested because they don't have too learn new language / tooling to do mobile dev. Learning Swift isn't any more appealing than learning Objective C.
I care about syntax so Swift is far more appealing to me. Compare print("Hello, world!") in Swift to Hello World in Objective-C, which the article jokingly calls "gibberish."
https://www.binpress.com/tutorial/objectivec-lesson-1-hello-...