Well in Australia we semi had it, since the min age is 15+ for the worst video games, you could pretty much tell, if not, then you get asked on ID (Which most often, people under 16 don't carry it around with them).
But I agree, it is a good policy, will at least let the blame levels go down alot.
I'm sure forcing people to carry around their driver's liscence or at least student card won't be too hard, everybody else manages to carry around identification.
Biggest problem is that there is alot more negative stigma against older people supplying beer/ drugs/ etc. to younger teenagers, but they don't seem to see the suverity of the problem, and it's effects it can have on those under age.
As you said, it's only a start.
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