With Angular 2 in hand, must I forget about using EmberJS or BackboneJS?

People say a lot about the new 2.* AngularJS version, about Typescript/Javascript/Dart, new features and standards from concepts to code..

In the past we had EmberJS, BackboneJS and the popular AngularJS (1.*) and that was my choice for my moment's reason and need.

• I would like to know if it's really a good choice to adopt the new Angular version.. Which from the 3 languages if yes, anyone?
• Can I stay in Angular, change it's version and mind about production with it's 2.* version?
• How much traumatic should be a migration from 1.* to 2.*?

Thanks!