You ask a good question. The upper east was already starting to show some age, even before all the other improvements to the stadium.
There is just so much they can improve the existing facility up there. There's not much room to add more restrooms, concessions, etc.
I would hope at some point in the future, maybe 10 years out, we would look at rebuilding the upper east, possibly with skyboxes above it, like a lot of people are doing now.
We could wrap it around the corners a little, to further close in the stadium. Maybe at that time we could remove that corner of the Edge building that sticks out, and tie in a new upper east with the new north.
I understand the Techwood Dr. concerns, but I think if designed right, there's room for a new deck and the road.
A new upper east would go a long way toward completing the stadium. Hopefully, as you say, someone is at least thinking in that direction.