IMO the leap from sublime to vscode was because the extensions made it so welcoming & bultin. I think the next leap from that is by-default sharing of those extensions and config. WASM might be able to do that coupled with security defining execution. We need a trusted mechanism to share what git-hooks promised without thinking about it. Like you said, collaborative.

If extensions lock down the files they will touch and the urls that can be visited I think sharing them becomes more palatable.