I'm actually hoping for a transition to a situation where your favorite web framework, will come with its own web-based IDE.
Esspecially at the web-development side of things, IDE integration isn't optimal. It's not so much that the languages themselves need better integration; it's the frameworks, and the abstractions and tooling they bring.
When it gets this easy to create a web-based IDE, why even bother trying to develop a one-size-fits-all super IDE? Why not just have a simple IDE that targets one particular framework and its (likely opiniated) workflow? I mean, right now, most of that stuff, targets the command line as their primary UI.