The specific problem is that all the competitors to Github have to use git, and that limits how different they can really be than Github and thus how aggressively they can compete to win users
Problem for whom? Users who are happy using git? Or conartist86 who is thinking about how to get money?
> the competitors to Github have to use git
Why? Syncing between various VCSes has been a thing since forever. If you can't handle a compatibility layer to support git+new-better-thing, you don't have the technical chops to build new-better-thing in the first place.
The way I think about it, if I make a backwards compatible product I might end up with users who never really wanted any change at all, and those people would be almost impossible to make happy. Those are the "faster horse" users. What I need is to find the people whose life would be changed by a car!
If you would like me to list a single concrete technical idea, I am pleased to oblige. The idea is: universal gaps. Our syntactic-semantic documents can have holes in them, places where we know some content is missing. That allows a document to behave like a template which lets us fill in the blanks. In a text-editor-based IDE there is no equivalent, which means that when I go to make a new sticky regex in Javascript I type //y and the IDE thinks I meant to comment out the rest of the line. It has no way of expressing the concept that between those two slashes something is known to be missing, which is exactly what I want to be able to tell it so that it can understand the difference between the state when I'm about to write a regex body and the state where I'm about to write a comment body
