I always refer to the "1-9-1 Rule" for this situation, courtesy of an old merchant sea captain who explained it to me from his many years on the ocean. Take 10 guys on his crew. One of then will absolutely excell and go above and beyond the call of duty. 9 of them will just do what it takes to get a days pay, nothing more, nothing less, just enough effort to get by. And finally the last one will be incompetent and lazy and and just plain unqualified.
This rule generally holds true. In fact, it could be explained by the "bell curve" phenoemenon.
Generally speaking, the younger guys only care about partying, girls, wheels and fancy cars, cell phones and so forth. Surprise....they are acting like....young men. Amazing.

I have noticed that there isn't much enthusiasm to excell in this field among the younger set (and I am under 30 so I suppose I speak with some authority.

) If they don't care about the trade and don't want to learn, they will fall by the wayside in due time. Those who dedicate themselves to the trade will rise to the top.