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Dennis, well since Elfwreck spoke of 20-30 years I answered keeping this in mind.
I never meant to state the same true for sources from the Linotype era, when typesetting meant feeding a machine with lead and the only backups were hardcopy or microfiche.
the guy who assured me RTF is still (i.e. I'm aware of the status slowly passing) regarded pretty universal is working as a typsetter himself. his argument was, it's known as export or conversion format by pretty every text editor, and imported both by by quarkxpress which was for years the leading piece of soft in this field, as well as by the adobes. he also pointed out docfiles are everyones creep, due to inter version and plattform differences.
your example portraying the lifecycle of 70+ years on from creation up to now is far beyond what i answered to. but apart from that my kudos to said company for what they do.
In case of the really old stuff I'm softening my point to "if the still have copyright for that the might have taken care about media transition of backups at least in 15y cycles, what would lead to having digitized tapes with a file format still readable now.
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