I skimmed through all these, but his wife was a hoarder. Was she really a hoarder or just a fabric nut? That's quite a lot of fabric.
If you are seriously considering buying it I would come up with a plan that doesn't depend on others to buy it or help you sell it. That would be quite the undertaking. Buy it for your own reasons, which should be that you want to buy that much fabric. It probably won't be the "dream come true" you envision. One persons definition of the mother lode is anothers nightmare.