Y'all could switch to .410's and cut your shot use by half. Waterfoulers could change over to fishin lures, since it worked for me once I figure it's a viable option.
I figure as long as there is a fair sized market, someone will pursue a solution that fills the need. It may be expensive, but as the population increases and takes more habitat, all outdoor sports requiring natural habitat land are becoming rarer and costlier. So, I figure this sport of hunting will eventually get more and more expensive as the population increases, until it gets impractical for the working Joe (as some of it already has). So be it. It seems that the masses, in general, would rather procreate and deal with the consequences later.