I'm from central SD originally and help my dad with his land there. We didn't plant an acre of corn and only about 2/3 of soybeans. We opted not to plant any corn because my dad is retired from cattle. But many acres of corn went in late (mid june) for silage or forage. The cattleman I spoke with were actually less concerned about hay/silage feed and more concerned about a shortage of corn stalk bales for feeding rations and bedding since very little corn will be harvested for grain.
I will say I think fears are going to shift. 2 weeks ago I was feeling good about hay production and now I'm looking at the calendar and its really setting in that I'm scary close to only getting 2 hay cuttings if it gets cold in early September.