Honestly, I don't understand what the hoopla is about serving specialty beer and fine wine in the MK. It's not like they're going to have beer carts around MK, it's in one restaurant to enhance the dining experience. It's funny, everyone seems to want Disney to change and update and compete w/ Universal, but when they do, there's outrage that there is change.
It's tough enough to stay afloat in this economy without trying to better your brand. If they think that creating a fine dining experience in the MK will enhance their business, then good for them. No one seems terribly outraged that you can buy beer or wine at the other parks or at the resorts.
It comes down to this... it's a choice. If you don't want to drink alcohol in the MK, you can choose not to. If you do, you will be able to eat in a restaurant and get a beer or a glass of wine. If you don't agree with the choice, don't drink the alcohol.
Me, I don't tend to drink...but it doesn't bother me either way. If someone would like a glass of wine at dinner and they're over 21, knock yourself out. The majority of people are STILL going to be family people... you're not all of a sudden going to attract some seedy crowd.

To be honest, I've never noticed drunk behaviour at Epcot or AK or even at our resort. It's not going to be the majority. There's going to be one bad apple in the bunch no matter if you're at Chili's at your house, or if you're at MK. It probably won't make your vacation worse though.