I do think alcohol is a slightly difference thing to the other list of other reasons which may led to a trip to A&E that people have suggested.
Given its already an offence to be drunk in a public place, if someone is out drinking and ends up in hospital then really they have actually broken the law. And in that sense, in theory rather than making it a charge for using hospital services, they could enforce it under the law as drunk and disorderly fine.
I don't think its a good idea, but I think that it could be done in this way, by the backdoor.
The real danger I see is not whether this is the start of a slippery slope of charging people for care. Nor do I see it as an issue for driving people massively into debt. I actually find it slightly sad that people have suggest money as being their concern over the biggest issue here.
And that is if people know you are going to face a fine or a charge if they went to A&E when they were drunk would it put people off taking going to get care in situations which potentially could be very serious or indeed life-threatening?
If alcohol consumed whilst out on the town is the biggest issue here, then perhaps a crack down using the law mentioned above more generally, actually on the streets would be the bloody obvious and more practical solution rather than doing it in A&E and using the money to fund it that way?