During the 1980's and 1990's there was a lot of talk about the future of ammunition and hose brass and steel cases were going to be a thing of the past at the end of the millennium. Well, obviously, that never happened. Caseless ammo was revolutionary as were the G11 and ACR weapons developed to fire them. http://remtek.com/arms/hk/mil/g11/g11.htm
Now, caseless ammo would probably have killed the reloading industry, but would have made buying ammo a lot cheaper. No more need to tons of primers, cleaning cases, or even brass cases. Powder and a bullet is all that were needed. For many years testing and refining of this new ammo was done and all published results said the stuff worked great.
Just makes you wonder what the next great improvement might have been that just passed us by.