Question - How will Google Dart get Popular?
Answer -
Google is working hard to get Dart embraced by web developers and the community and provide support, tools, and an execution environment.
Google will enable Dart in Google Chrome by incorporating a native virtual machine, while Microsoft and Mozilla will be encouraged to follow suit.
Google will release a Cross Compiler that will convert Dart to ECMAScript 3 in browsers that aren't Dart. This will be a big step in integrating Dart Virtual Machine with all major browsers, and it may take some time.