Future of Admin Toolbar if Toolbar is removed from Drupal core

Problem/Motivation

It has been decided to replace the Drupal core Toolbar at the top, with a Navigation solution to the left in 📌 Redesign the toolbar Active and https://www.drupal.org/project/navigation → .

Some users may prefer to keep the Toolbar at the top, and find the new Navigation in the left side not ideal ...

Steps to reproduce

Try the new Drupal core Navigation module, and find that the existing Drupal core Toolbar module with Admin Toolbar contrib module works best.

Proposed resolution

What's the future of Admin Toolbar if Toolbar in Drupal core is removed? I hope it can carry on here in Admin toolbar, or maybe Drupal core Toolbar module can move to https://www.drupal.org/project/toolbar → ?

Remaining tasks

User interface changes

API changes

Data model changes