...and so it looks:
Our good old black taskbar will probably go away.
Earlier the significant changes on the SO were later applied to the smaller SE sites as well (remember as the user pages were divided into two).
I suspect many can think, maybe the SE Inc made a lot, much better developments as well, compared to this change.
If you would like to remain at the current version, I would suggest to do every reasonable (incl. SE communication) to delay this unfortunate change...
Particularly for mods, they have access to the mod chatroom.