I was planning on seeing them in spring, but managed to contract Mono a few days before the concert. That album and Transatlanticism by Death Cab for Cutie got me through that period. Thanks for your condolences.
The tension between Jay Bennett and Jeff Tweedy are what made those earlier Wilco albums so great. Two incredibly talented musicians who seemed to not being able to stand one another, and yet that relationship fed them and made them greater than I think they realized.
Yes, that line in the movie is so powerful. Watching the effects of them touring, how they beat themselves into the ground on a nightly basis, it makes you realize what they had on the line and how much the music meant to them.
I make music as well (nothing recorded, planning on doing some singer-songwriter stuff similar to Tweedy soon though), and the way that they represent their own music is amazing to see, even if just in film.