Since this is sufficiently important to merit its own mention in the Annual Plan (Product Programme 4 Objective 1 Goal 1), I suggest that it should have a page here to describe the goals, roadmap and so forth, as a locus for community engagement. After all, the discussion around the Technical Collaboration Guideline/Community decisions makes it clear that the absence of such a resource would be a blocker for community adoption in and of itself.
Topic on Talk:Parsing
We are still figuring out the specifics of all of this and it has been one of the topics of our offsite. The unification has been long overdue and we will publish more details of our thinking as it comes into clearer focus. But, till such time, you can see some thoughts at Parsing/Notes/Two Systems Problem.
Thank you for that reference, but it does rather sound as if you take the view that this is purely a matter for internal discussion. I suggest that you involve the community of people who use the editor(s) and parser(s) on a regular basis who will have some useful insights as to what does and does not work well in the various systems at present, and where they might want to see the tools that they use going. Having a prominent pointer here to Parsing/Notes/Two Systems Problem or wherever you choose to host that community engagement, with a framework to structure the discussions, would undoubtedly be of value to the project at this stage.