I kinda skipped the middle part of the discussion but, concerning very young drinking and small amounts of alcohol...
When I was a baby my parents used to slip a few drops of rum in my milkbottle, before bedtime. It helped me sleep better and from what I've heard, more parents have done that. A few drops really do not harm anyone.
I think drinking is kind of like sex. You start when you are ready. I'd prefer to see the agelimit of drinking rather as a pointer then hard-law. Just like sex. If it's consensual and not dangerous, let it be.
And about that controlled environment... well...
Of course there will be uncontrolled houseparties. But teenagers now get the chance to drink in bars, pubs, clubs, wherever. There, they generally will be supervised by barpersonell. True, houseparties will still be uncontrolled but at least not all teenagers will be drinking uncontrolled.
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