Lower cost lighter casings seem to be the new push... not really a shocker. I posted up a while back how the military was looking at adopting a 338 as a belt fed machine gun with polimer casings.
While reloadability is nice it's not necessary for military firearms, and it's even less important for inexpensive rounds like 9mm. Can you imagine this kind of reloadable tech adopted for 308, 556, or a 338 chambering? Everyone and their brother would be rebarreling their guns and buying those reloading gear. I think cost is the biggest reason why people don't shoot more and if there is a HUGE advantage to reloading then it would seem like a no brainer move especially for rifle cartridges.
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