I don't agree with the suggestion that there should be a random high-success time. That's silly. Crafting is already partly random. It will randomly benefit a few people or possibly no one at all.
If there should be a high success crafting day, make it Christmas or New Year's Day or something.
Other than a small concession like that, I don't think this will happen, even though it would be great. SKBs will remain integral.