I suppose that could happen but I don't think I will have a problem with the beans not being ready before corn. 

I have been thinking of 30-40ft grass headlands.  But the cars on the highway get pretty nervous when I hang the 120ft boom in the ditch with a 90 ft headland now!!!      LOL    :)

Until I see a big hit with beans on the headlands every year, I don't think I will change away from them.