It's a good idea to keep in mind that drug manufacturing is a business, and one of the primary motivations for a business is profit. I'm not saying that's the only motivation for all drug companies, but without profit there's really no point to being in business, particularly for a publicly traded company. Treatment and management of a chronic, irreversible disease like T1 ensures life-long customers and an ever-increasing income stream as more people are diagnosed, especially now that people with T1 are living longer and longer. The monthly costs of maintaining tight control of BS is pretty significant, and then there are pumps (about $6k each) and CGM's (don't know the cost), and I understand there are consumable items needed with both of those gadgets. And, if the manufacturers can get doctors on board with putting their T2 patients on a T1-like regimen, with the skyrocketing rate of new T2 in this country that could add up to huge profits, particularly in an insurance-driven health-care system like ours where patients don't necessarily know how much everything is costing. Why treat T2 with diet and exercise and oral medication, when you can have life-long consumers relying on an expensive regimen, who are unaware of the cost of the treatments they are receiving? I think drug companies have figured out that a cure for T1 is do-able and will be here within a decade or two, so it's smart of them to start shifting their existing T1 treatments over to the much larger and ever-growing T2 population.
I don't think there would be much profit in creating a preventative vaccine for T1. It's not communicable, is not necessarily deadly, management is state-of-the-art so risks of complications is respectably low, and the effected population is not huge. I don't think it would ever become a standard recommended vaccine, but probably only used with people who have already tested positive for the gene marker or antigen. There is enough public awareness and reasonable caution around vaccines now, that it would be difficult to make a T1 vaccine mandatory for the entire population. Just look at what happened in Texas when the Governor tried to make the HPV vaccine mandatory.
There's not a whole lot of "pure" research in the medical field out there anymore. Most of it is funded by pharma companies who have the rights to any discovery, and that guides the direction of the research. The cure is going to come through privately funded research (know any billionaires?) and government grants (how many of those are left these days?). That's why JDRF gets my donations :)
I'm sorry if I've come across as cynical. I think we just need to keep in mind that drug companies view us primarily as consumers, not as patients, and we should make our health-care decisions accordingly.
Hoppin' off my soap box, now...