HO - I hear what you are saying but as an ex-employee of the Australian Baseball Federation, I struggle to sympathise with the underfunded plight of BA.
These are not rocket science type issues. I suspect Australia will never have a model which will retain these kids in Australia - unless they are a 'can't miss' talent (and I dont really think there is such a thing), or they have no desire whatsoever for tertiray study, we simply cannot compete (hmmm - do I come back from the US with a usable degree (which may require a single-year conversion at most), no debt, having paid sweet FA to live and had a life experience, or do I pay for all of the above and pay for the privilege of playing, either directly or indirectly - again, not for everybody but if it works for you it doesn't seem a tough decision).
So rather than try and block the US colleges by putting their head in the sand and doing nothing, perhaps they could try actually talking to the kids, staying in touch, providing guidance and advice, staying in touch so whent hey return from college they can contnue to contributeto the game as a player, coach, administrator or volunteer - I storngly believe these sorts of players (the talented but not elite) should be the backbone of the grassroots gamein this country. Make no mistake, I am disillusioned with the process - but I dont think the situation is irretreivable.
I think our current system absolutely fails most of our talented kids (and please make the distinction here between talented and elite - our elites survive but I'm not sure its becasue of the system or in spite of the system). They are squeezed into a one-size-fits-all development program, torn between up to 13 different programs a year and the one key service they need (in my humble opinion), support, guidance and advocacy, is completely absent. I've worked in our deveopment programs across two states for many years and I have, unfortunately, come to the conclusion that their impact is minimal in terms of developing high quality players.