I think most of the big names will not go out and get their animals tested.
Their logic being that they've been doing a good job so far without animals dying of IBD, why would they need to test now? Not to mention the concerns T&C mentioned and potential cost of testing hundreds of animals.
If a collection or facility is full of carriers and animals that are positive for IBD, I doubt a lot of the larger breeders are going to announce it publicly.
Although, ideally, I do think everyone should get their animals tested.
It's no different than getting dogs health tested.
I have Dobermans and I personally would not want to purchase an animal that is positive for DCM or vWD.
I don't expect health testing reptiles to be a standard practice for a long time.
I also do think there needs to be more research on the matter.
But in the end, I wouldn't be opposed to getting my animals tested. I think it would be easier for smaller hobbyists to test as wel.