Sadly, alcohol will never be banned as it raises too much revenue. Stopping on board sales will only cause more people to open the booze they have bought in the airport shop.
A few drops of opiate in their G&T might help.
Rainboe, you have it wrong, I'm afraid. The drunks you saw on your travels around Europe would almost certainly be Brits. Having lived in Berlin, Corfu and Palma for a few years each, I can say that local folks who had taken too much drink would perhaps be seen on the street during festivals. Out and out drunks, wasted, drunk, staggering, rowdy drunk, on a regular basis, week in, week out, as is the case here in UK, is very, very rare.
I have no experience of the USA so cannot comment.