Let me start by saying that I do not have children, however I go to Disney atleast once a year and it is by far my favorite place to vacation. I have been to Disney during Spring Break, summer vacation, in the middle of winter, and I have only experienced seeing someone tipsy on a few occasions, but it was never to the point that it was causing a problem for other guests. I enjoyed my 21st birthday in WDW and I spent the entire day drinking, however I knew better than to get drunk in the parks and waited until I went to DTD and then back to my hotel before I was even close to being drunk. I think that most people have this much common sense and will not get completely wasted in front of a bunch of children.
I enjoy having a drink or two throughout the day, and I also enjoy having a drink with dinner, that does not make me an alcoholic and it does not mean that I cannot go a day without drinking. I have never had an issue with the MK being dry, however I have often gone to one of the resorts for dinner, not just because I wanted a drink, but also because the dinner options in MK are not as good as at one at the surrounding resorts. I think that opening BOG is going to be a great thing for MK because it seems that they are trying to have a more upscale dining experience which may keep more adults/families in the park for dinner. I can only enjoy Crystal Palace or Tony's so many times for dinner before I am tired of it, and after a long day I enjoy sitting down and relaxing with a nice meal and a drink.
As others have said, its not as though anyone can just walk up to BOG, grab a drink and walk over to TLM, the restaurant will only be serving drinks with dinner, and as we all know, making a ADR is hard enough for one of the regular restaurants in WDW at 180 days out, I can only imagine how difficult it will be to make one for BOG, so I highly doubt there will be many, if any times during the year that people can just walk up to BOG and get a ressie.
MK is my favorite park because to me it is a place where I can escape the world and focus on what's important, spending time with the person I love. Even if they were to allow alcohol to be served throughout MK, it would not take away from that experience for me. I would enjoy having a drink during the day at MK, sometimes its nice to just sit on a bench, relax and people watch, but its not something I need. And just because MK is a place where I escape the world, it doesn't mean that I want to escape everything, it just means that for one day I can get away from people back at home, or watching the murder count in Philly rise on the news, or getting stuck in traffic.