It wasn’t long ago that wine on tap seemed like a radical idea. But no more. There’s hardly a decent restaurant in the Bay Area that doesn’t serve wine on tap. And, according to Malia Collins of Free Flow Wines wine on tap, which has long been getting the notice of restaurants across the country, is now becoming a part of the initial planning stages for new venues. And while much premium keg wine is found only in California, that and more is changing; the fact is that premium keg wine used to be the domaine of the small, local producer.