This is great news.
As long as they are functionally equivalent and you feel the new one is stable, I don’t think we have to worry about keeping the old console. Since we have a CLI and API I doubt people are scripting web ui clients. Web UIs in general are expected to change / evolve over time.
How much extra fat would that bring to the server distribution?
The current console is about 10 MB, HAL.next is something around 7 MB.
So if we replace the console we would save 3 MB, if we keep both that
would add 7 MB.