I keep expecting some kind of gene therapy treatment to materialize, but given the cost of things like gene therapy, it'll probably be a long while before that ever shows up. Plus, apparently the genetics of it isn't cut-and-dried. There's multiple genotypes of lactose tolerance, suggesting that there's no single gene that can be flipped to remove adult intolerance.
C'est la Brie.
I've also heard some types can stop and start pretty much at random. It's a weird condition.
Well, there's a type that isn't genetic but is instead cause by damage to the intestinal wall (from prior infections, for instance). That one is actually reversible with enough time, probiotics and gradual reintroduction of dairy to the diet.
I got the classic "adult onset" kind. Hit me in college, when I started having a bowl of cereal before hiking to my first class. Noticed a pattern of being...otherwise indisposed for most of the latter half of class. Except for the mornings when I was running late and skipped breakfast. Didn't take long to piece together what was going on. At first, it was just pure liquid milk that was a problem. Then over time, cheese became more of a problem. Now, it's gotten to where almost any dairy ('cept for things like yogurt or acidulated cheese, which are kinda 'pre-digested') is a problem. I figure at this rate, eventually I'll just look at a cow and race to the bathroom.
What's annoying is that there's a community of lactose-intolerance "deniers" who insist that it's not a real condition, and another community of people who insist that lactose-intolerance isn't a medical condition, because of its predominance (i.e. the "we're normal and its you lactose-tolerant people that have the 'condition'" attitude I was spoofing) and that any attempts to find a medical "cure" or "compensation" are insulting and wrong. It's kind of akin to the people with congenital deafness who refuse to allow their children to get cochlear implants because "there's nothing wrong with being deaf".
If you look at the talk page for the Wikipedia entry on it, it's a wall of people getting in a huff based on the above viewpoints.