I don't think anyone would have bothered indicting him. He was out of office, disgraced, as was his whole administration including VP Spiro Agnew. Oil-producing countries were getting uppity and we had fairly recently gotten out of Vietnam. I really don't think dragging out the whole mess was foremost on the minds of the American people. To what end? To put Nixon in prison?
I was a newly minted teenager asking my lawyer father: "Is it evidence before someone subpoenas it?" Wondering why he made the recordings in the first place, if not to preserve information. Nixon's own self-centered and paranoiac leanings his undoing. Interesting man. A lot more interesting than Trump. Wheels within wheels, while Trump is just a grotesque and gargantuan infant. His facial expressions reinforce my opinion - I can only see his mouth as either suckling a teat or puckering to deliver a fresh load of diarrhea (or puke). Certainly whatever comes out of it is certified BS. I can't fathom how disaffected the nation must be, to deliver him a win the Electoral College.