If those tree rows are at the end of there life cycle, why not replant? I live in the Red River Valley, seems to be several tree rows being taken out and burned every year, while the farmers DONT practice no-till. Then comes the spring like we are having, extremely dry and windy, not that top soil ends up in the ditch and I hear farmers complain! And I think to myself "come on man!" don't take a tree row out or if you do, replant one!! If the no-till will keep the top soil on, don't till up black in the fall and spring! Blows my mind on the excuses the farmers give or other give for the farmers.
The reason not to replant is that those tree rows can be a pain in the ass. As they get older they are dropping branches during every wind event. It really sucks to clean up branches every time you seed, harvest, or do anything in that field. Also bigger equipment makes it tougher to farm around all those tree rows. IMO they don't really help all that much with wind erosion and can actually make the wind worse depending on the direction, think of how wind increases around bridges and buildings.
I have cattle so trees are very important to me for wind protection in the winter. I've planted lots and have plans for more. My biggest complaint with tree rows in my area is leafy spurge showing up in them. A real pain in the ass to control that in trees