I didn't really spent time thinking about it, because from reading their issue tracker, I very much doubt neovim would consider something like that. Partially because of how much of it is already vim specific and it would be very difficult to abstract that away, but mostly because of ideology.

You can already to a lot in Neovim with plugins, including recreating Helix, Ki, whatever. But the problem is that the vim state machine is always present underneath it, resulting in unwanted behaviors or impossibility to implement some things. I would envision it to pretty much allow to listen on raw keyboard and mouse events. However cursed it sounds, it should be possible to fully implement vscode or any other editing model in neovim