I know that sometimes there isn't room to move down. It is also difficult because our trains were not designed to have so many standing people on them, so some parts of the train have areas where you have nothing to hold on to. I myself dread the enivitable push down to the middle where you only have gravity to hold you in your place. It is a no win situation, unfortuately.

I do think there should some train ediquette. The people who have to stand should get off the train first, then those who had a seat get off after. I hate it when some large man with a window seat gets up before London Bridge to elbow his way to the door.