Marionette.js?
I will look into backbone.radio but mn being 50k loc makes it hard for me to consume.
That said, an even better answer is to start using React for your views instead. I wrote a post about how we started adding React and Redux into our existing Backbone codebase, incrementally: http://blog.isquaredsoftware.com/2017/07/react-redux-backbon... .
Maybe when I have resources free to spend time learning new stuff.
But for now my mvp backbone $/ui/slickgrid connexion flask app is doing its job. And personally I like Javascript 1.5 more. Run that through closure-compiler and I have a lean js app.
gulping the cool aid was the last straw that broke the camel(damn missed perl) back. I'm happy if I can drive everything from py.