I think you're missing the point.
All of the proposals put a emphasis on USING the elevanted walkway. They drive pedestrian traffic up there by making it more accessible and inviting.
If you've been up there, it's a nice place to sit and people watch. You can see people skating, you can appreciate City Hall from an elevated standpoint, you can watch pedestrians on Queen St, you can look down Bay St.
The podium, which is accessible via the ramp is also put to use so eliminating the ramp would guarantee that nobody would go up there.
As for the elevated walkways blocking the view to City Hall, Zeidler's proposal solves that by removing the view blocking concrete walkways and replacing the sides with glass.
Finally, the West and East edges:
Bay St. is solved by a couple of the proposals by making them long wide sidewalks which people will use because there will be no need to cross the street to avoid the current dark, patchy, homeless ridden stretch.
The West edge is put to good use by mostly all the proposals.
I don't see what you're saying because all these problems are solved in one way or another by the presented proposals.