Long-
There's a wild Concord vine at the old homestead that I transplanted there from "the woods" when I was a teen, in the late '50s. The folks who live there, now, keep it pruned by running over it with a Bushhog every now and then, and it still produces after they do that. I took rootings from it when I retired and returned to the area in '86 and those vines are still producing at the houseplace I sold in '03. I took rootings from them and brought them to the new place and that's some of the vines I tend now.
The point: your Concord may be around a while. I keep mine pruned back to about 8-10 feet of producing vine; after they get 2-3" in diameter, they can support two runners, and cut the excess clusters off after they set fruit, to manage it. Like I said before, it ain't rocket science and doesn't take a lot of time.