I think a part of the problem stems from a lack of Physical education at primary school level.
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There was a time when the Little League used the VFL/AFL goalposts...
As a junior, we played cricket under the same conditions as the men and were better for it. Obviously there are a lot of choices around now, but while young cricketers are just as naturally talented as they were a generation or two ago, they also seem (as a rule) to be less passionate, dedicated, knowledgeable, resilient, and less determined to win. Maybe it's a Gen Y thing, or maybe it's the modern promotion of participation ahead of competition at a young age.