The best business people in the world are usually considered the biggest asssholes, they take down anyone around them to get to the top, and honestly that's the best way to do it and i hold nothing against her for doing it.
As I have always said, you can tell how much Randy meant to her in the Japanese documentary, when she breaks down towards the end its just

There is no doubt we will never see this stuff, maybe one or two small things will leak out over the next 30yrs but nothing else most likely. Kelly and Jack will inherit all this stuff and just have it to show there own friends who may be interested in Randy after Ozzy and Sharon pass on.
As far as footage, I think Sharon probably had a few of the early blizzard shows taped with the original band, They probably stuck by the fact that nothing exist because of the royalties situation with Lee and Bob, why admit you have something and be bother non stop about it for years and years if you know you will never be able to release it anyway.
So with that...In a few years Sharon will settle with Bob and Lee and then release the original albums remastered with the original tracks and then release a video of the original band playing somewhere to promote it

Ok those last two paragraphs are speculation but I would say I am 75% believing they have footage from the original band playing
