In economy class, have seats designed so that reclining slides the seat bottom forward simultaneously. This might alleviate some of the recline wars, since it adds a cost to the passenger reclining and reduces the cost of the reclining on the passenger behind, rather than having all of the costs of reclining being forced onto the passenger behind.
You beat me to it - this is exactly what I was thinking. This scenario SHOULD make leg room smaller as it makes the upper area larger. That way you are just reallocating the space you've been given, rather than keeping all your space, and some of the space behind you.