Not a lot to add, but I came across this old photo from a Tribune article from just before the Bears played at Memorial Stadium for a year.
And it seemed relevant to the discussions about this new scoreboard being a mainstay in the SEZ and building any upgrades around it. It got me thinking how the relatively tiny addition of those temporary bleachers behind the provided a surprising amount of needed height to the Horseshoe, and it sort of puts in perspective how we could REALLY improve the area with not that much. Forgive the bad artistry with the scoreboard just being a big black box, but if we...
(A) Put in this new awesome scoreboard.
(B) Brought the SEZ stands down to fill in the empty space in front (badly needed ... priority #1, IMO).
(C) Lastly, build anything "up" or "back" in a way that works around the scoreboard.
... you could really transform that area for relatively little cost (in addition to the scoreboard).
Again, hardly my best work.

However, by just doing a quick cut/paste of each section of temporary bleachers and putting them to each side of the scoreboard, it at least shows the space we would be working with well. I imagine other elements would be involved such as potentially sprucing up the SEZ seats themselves, redoing the concourse behind the SEZ and (of course) having some money-generating suites on either side of the scoreboard instead of these cheap temporary bleachers. But the main point is that I DO think we can get a pretty good solution to the SEZ without ripping the whole thing apart. The one thing that would still bother me is how gradual the slope of the stands is (ideally, a new structure could be built with a much steeper angle to create a "wall of fans" aspect), but as long as whatever we do helps close in the stadium significantly (which, again, NECESSITATES adding seats in front of the Horseshoe and adding height in at least some way), I will consider it a win!