Why not build a great dynamic language on top of Dalvik? All the alternate language projects for Android that I'm aware of are either native code (that uses JNI

Why not build a great dynamic language on top of Dalvik? All the alternate language projects for Android that I'm aware of are either native code (that uses JNI to talk to the UI code in Dalvik) or are existing JVM languages that are poorly matched to the Dalvik VM. Dalvik isn't a Java JVM, it doesn't use Java bytecode and it has a significantly different architecture than JVM's. It's possible you might be able to make a language that's a better fit for Dalvik than Java is.