I like the enthusiasm of those who want to stand for the whole game. I certainly wouldn't trade it for people who sit and don't care. However, those who like to stand seem to think that it is the only way to show support for the team. And there are really key expressions of support that are being lost, such as the impact that comes when the entire stadium stands up at a key point. You lose this when everyone is already standing.
And, my feet hurt bad!
However, I would much rather stand in pain with a crowd who cares than sit comfortably with a crowd that doesn't.
Unfortunately, there's too many that wouldn't.