My favorite topic! Lol, obviously, I think the Horseshoe is the biggest issue ... and I will try to explain why using something I just realized the other day. I think a lot of fans subconsciously expect any "cool" stadium to either (A) extend its architectural theme all around the stadium or (B) have a very clear setup where one end zone is purposely meant to look different. Examples:
(A) Tennessee: A perfect bowl shape.
(B) Ohio State: One end zone fills in the (actual) "horseshoe" look, while the rest of the stadium looks like a bowl.
The jarring thing about Memorial Stadium is that we have totally inconsistent looks on all four sides. We used to at least have very beautiful symmetry with the West and East sides, but we renovated the West side only to not look the same. Here is an interesting exercise to kind of show this. Assume that in a perfect bowl, there are twice as many seats between the end zones as in the end zone seats, based on field proportions. Thus, if you extended the "general look" of each side of Memorial Stadium around all four sides, you'd get these capacities:
East: 28,000 ---> 84,000 (28,000 on East/West sides, 14,000 in each end zone)
Horseshoe: 9,800 --->
58,800 (19,600 on East/West sides, 9,800 in each end zone)
West: 18,000 --> 54,000 (18,000 on East/West sides, 9,000 in each end zone)
North End Zone: 5,000 ---> 30,000 (10,000 on East/West sides, 5,000 in each end zone)
The East side of our stadium looks grand, tall, intimidating, architecturally impressive and like something you would expect for a "big time" football program:
... the Horseshoe, when you imagine it without the scoreboard, has the height of something that belongs at Sam Houston State:
The Horseshoe is so short and unimpressive from an architectural standpoint that it looks jarring and strange in between our much prettier East and West sides. Even the North End Zone, while having HALF the seats the Horseshoe does, at least looks tall. The fact that the East and West stands are too far from the field of play also stretches out the Horseshoe horizontally, which emphasizes how short it looks even further.
My dream renovation would be to do the following:
1. Wall off the East Main seats underneath the overhang, and put a brick wall in its place to match the one in West Main. Not only does this return a look of symmetry to Memorial Stadium, but (IIRC) it also frees up about 7,000 seats to distribute elsewhere without raising our capacity too much.
2. Demolish the Horseshoe. This frees up a further 9,800 seats to use. So, with East Main updated to match West Main and the Horseshoe gone, our capacity is at 43,870. That gives us 16,800 seats to use on either an improved structure in the South End Zone or fixing up the North End Zone somehow.
3. Build a structure in the South End Zone that matches East Main and the East balcony exactly, with a "South Main" and a "South Balcony." This would give us a bit of that OSU look where we have an ACTUAL "horse shoe" stadium, but this new structure in the SEZ would actually only use about 10,500 seats, making our new capacity 54,370. I think at least 60,000 is appropriate for us NOW and I have faith this program will continue to grow, so...
4. Demolish the NEZ, too, and build a mirror image structure of 10,500 seats in that area that matches both the East and South sides. This brings capacity to 64,870 - something we can absolutely fill up if we get this thing rolling.
TL;DR
The East side of our stadium is currently the only "traditional" looking one, and we should emulate that look all around the stadium. Effectively, we make Memorial Stadium into a "square bowl" so that we can still see the beautiful towers on all four corners. In effect, we create something similar to Borussia Dortmund's legendary Signal Iduna Park but with our beautiful column towers in each corner: