Evolution of nitrogen fixing outside of the legumes is really interesting from a plant physiology perspective, but we're also already swimming in staple grains to the extent that a ton are being wasted either directly (by not being utilized), semi-indirectly (through processing into low-nutritional-value foodstuffs that aren't necessary for a healthy diet), indirectly (by feeding to animals whose meat is then wasted), or doubly indirectly (processed into biofuel that is a net greenhouse gas emitter). While reducing our collective fertilizer footprint is great, we can do that by applying less/long release fertilizers and growing less damn .

Granted, this criticism doesn't apply to growers in poor areas who can't afford fertilizer but it's not like our global IP regime is really designed to get beneficial hybrids into their hands in an efficient manner.