I have gone to one of the Sweetwater "tours" on Friday afternoons. They charge for a glass and you get 6 tickets for refills. There is live music and hundreds of people dressed up with their cologne and polos as if it was happy hour. To be quite honest, it seems to me that this "tour" is more of and excuse to sell beer...um...glasses. Since they are a brewery they have the beer to be "sampled" on the tour so they don't have to have a liquor license (or whatever) like a bar would have to have. I can see why they would want to impose this restriction. If you want to serve beer like a bar then you should have to do the paperwork that a bar has to do.
The tours are a clever way to cover up the fact that you are running a couple-times-a-week happy hour.
But with that being said, I oppose this change since I oppose most government over regulation of what people (and small businesses) do on their own property.