As a next-generational farmer I can assure some that there is no need to be overly concerned about the regeneration of trees, it is automatically done in nature.
Back in the mid-1800's, a common fad here in New England was in the grafting of trees, mostly
apple trees, but others as well. One reason I have never really posted much on orchards is simply because the trees we gather apples from have been here since those times. Many are 18 inches in diameter or more, and while they are not as convenient to pick from as the dwarf trees of today, I use what I got. Some are sour, some are sweet, some are yellow, and some red; and while no one really has a clue what variety they are, I know you can't kill them. In a few area I have dug up old orchards and inevitably they come back through shoots.
I have a lot of history regarding what happened and where on this farm, but sadly fruit trees were not really recorded. They were messing around with them I suppose, not sure which ones would work out or not, and definitely not knowing some 170 years later they would still be growing.
The owner of Johnny's Selected Seeds I guess is a huge
apple variety investigator, and I tried to have him out once to identify a few of these odd-ball varieties, but sadly he was going through cancer at the time and could not do it.