> Would programmer type B want to work with a 2 year old project from another type B programmer?
Sure!
A homegrown javascript ecosystem doesn't grow up in a vacuum. It may include smaller libraries that aren't as opinionated as this year's popular framework. It may draw inspiration from Backbone or Flux without using either outright. And it should follow familiar design patterns.
Now, the answer you probably expected was "I'd want to see it first." And that's true, but that's also true with a framework. The things that make a project pleasant to work on - good architecture, docs, clarity - aren't guaranteed with a framework.
Sure!
A homegrown javascript ecosystem doesn't grow up in a vacuum. It may include smaller libraries that aren't as opinionated as this year's popular framework. It may draw inspiration from Backbone or Flux without using either outright. And it should follow familiar design patterns.
In fact, some frameworks start out this way (https://ampersandjs.com/).
Now, the answer you probably expected was "I'd want to see it first." And that's true, but that's also true with a framework. The things that make a project pleasant to work on - good architecture, docs, clarity - aren't guaranteed with a framework.