Well this gets into the conversation above, the shield IS "just a letter", in the same sense as the Wisconsin motion W, or the Minnesota M. It's a single letter logo that has enough to it to be recognizable across contexts. That Purdue logo has the same quality.
I would argue that the Nebraska, Michigan and Rutgers logos suffer from the same problem. Though those letters inherently have a bit more to them than an I.
Nebraska and Michigan are like many storied football powerhouses in that their uniforms, especially their helmets, are essentially a brand identity unto themselves, and are able to be used as such in a lot of contexts.
Maryland and Ohio State have what I would consider lame-o cop outs along the lines of our slant Illinois logo or putting the block I in front of the state outline. That is where we're headed, some additive element to give it just enough.
Wasn't that your thought process in creating that concept? That an unadorned I at a midfield scale just lacked a certain something? I'd be fascinated to hear your creative process on that, I could barely create what passed for art in elementary school.