I respect the bouncing around of ideas to raise the atmosphere but those who have mentioned that there are simply too few singers these days have already nailed the crux the problem. Why, then, would a different construction of the North Stand, a capo or drum-style initiative etc, make enough difference to those folk who are already indifferent?
It is a bloody shame, and more so for those who enjoy singing to be trapped in non-singing areas of the ground, and it could be so good with a little effort from many more - Hey Jude before the Villa game was just superb, and I was in the middle of the North Stand(!), the initiative aided that day, I suppose, by the pre-match tannoy.
But, especially with regard to stadium lay-out, if away fans from prem teams and euro teams (with or without drum) can make a lot of noise with a 3000, or less, allocation, then we should be able to do something pretty good with the 50-odd thou, which we occasionally do quite spectacularly.