Nitrogen fertilizer is massively over-applied globally. 1/3 less fertilizer will help with farmers paying attention to getting the best result for the lowest amount of N applied.

It will also increase interest in some better cropping practices like growing legumes as a covercrop.

So even though usage will be down, yields are unlikely to massively take a dive from less N.

The largest issue is drought/flooding and extreme temperatures. Climate change makes a farming system built upon more predictable weather insufficient.