What will happen is those that have better options will have kids. Similar to why there are so many people with last names of miller or smith. Both trades were

What will happen is those that have better options will have kids. Similar to why there are so many people with last names of miller or smith. Both trades were protected to a point by not going to war and having the means to have kids. If we still went with our father's trades as last names, the next generation would probably be full (relatively) of Jane and Joe Engineer.