Not sure if we could get year round corn or soybean production, need an extreme increase of winter temperatures to get enough growing degree days for 2 growing seasons, almost have annual precipitation east of I-35 to double crop corn. Daylight hours in the winter may not allow for year round soybean production.
Might be able to row crop March-October, then a plant cool season crops like field peas or lettuce for the winter seasons. Or even have year round hay production.
I'll probably be long dead when the temps get that warm.
Yeah, water could be an issue. We do corn in the Summer and wheat in the Winter. Corn, of course, needs a ton of water, but the Winter wheat, most years we plant in October, do one round of irrigation (or none) and then maybe one round of irrigation in late May (or not) right before cutting depending on Winter rains.
Of course stuff like alfalfa could potentially get an extra cutting or two, which helps a little. Not food per se, but food for our food.
But yes, we're likely talking hundreds of years.