“Farming with draft animals, while more time consuming, is VERY profitable. Ask the Amish about it.”
Your “more-time-consuming” phrase is very telling. If you assign no “expense” to your own labor, lots of stuff is “VERY profitable.” Heck, get rid of the oxen and resort to hoe tilling, and profit will really soar.
The fuel cost at some point will decide if it is worth the extra time. The small farm will probably die and we will be at the mercy of the corp farm for good or for bad. They sell on the world market and as the dollar collapses the those oxen may look pretty good!