I'd be willing to bet if you eliminated all of that you wouldn't have enough space to put in what you're asking for as replacement. Remember; a lot of that is using resources that already exist or (in the case of EA Sports Extra) it's stuff that's just tossed in to make something useful out of the last few MBs that aren't being used otherwise.
I'm not a big fan of a lot of fluff myself. The trophy case makes sense in NCAA... in Madden, it really doesn't fit. But I don't expect most of this stuff, compared to on the field stuff, takes up a ton of memory.
Honestly, I'd be happy to go back to PS2 quality graphics if it meant a faithful recreation of NFL football in terms of gameplay and at least 2k5 quality presentation.
People asking for hand warmers and 25 different sets of uniforms per team... I could care less. Give me a working Red Right 19 BOB, inside-out blitz pickup AI, a fullback who takes out the man he's supposed too, and a working 3-4 nose, I'll be a hell of a lot happier.