Possibly controversial #Linux opinion:
I think #Gnome should seriously consider moving the top bar to the side. 2 reasons:
1. Vertical space is more valuable than horizontal in most cases, because there's less of it (especially as the number of ultra widescreens increases) and probably most things you look at while not in full screen mode is taller than wide.
2. By moving the bar to the side the hot corner can be moved to the bottom, significantly decreasing the distance to the dash/dock