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The point is that I am very likely one of hundreds of thousands, if not millions, of similar descendants world-wide who can make the same claim. I harbour no hope that I can reclaim any of Virginia territory as my ancestral land either, nor even just get a green card for employment in the USA, on the strength of this.
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I dunno about millions, but the fact is that every person had two biological parents. Each of them had two, and so on. By the fifth generation back -- only about 100 years -- we are equally descended from 64 people. By the 10th generation back, we are equally descended from 2048 people. At 11th, it becomes 4096; by the 15th -- George Washington's era -- it becomes over 65,000. Everybody who is a direct descendant of GW is equally a descendant of 65,000 other people. Pocahontas is probably around the 20th generation, which gets into the hundreds of thousands. At some point far enough back, everybody is related to everybody.
So if E. Warren's grandparents told her that there's some Native American in her background, and her family's been here more than a couple generations, they were probably right, even if Warren can't prove it -- and she shouldn't have to.