What features should Java 7 onwards have to encourage switching from C#? [closed]

Answer 1

I think, choice between Java and C# is not a question of language features, but a question of platform and ecosystem choice.

So, I doubt that any new syntactic sugar in Java or C# can lead to a significant amount of switchers between the platforms.

After all, JVM world has Scala and many language-sensitive developers are using it in some way.