"So, in 2069, a bunch of scientists, who weren't yet born in 1969, can discard the experiences of Armstrong and Aldrin, of Collins in the orbiter and of the whole team of scientists in Houston, and reinterpret these events in the way that is politically expedient at the time."

So 100 years after the first Moon landing what more scientific information would have been released related to that event? The answer I would probably assume is none, so scientifically, there would be no change and the records of the work done and the records of the mission remain fixed in time.

OK now take a look at it not scientifically, but historically - ask the same question.

What more historical information would have been released related to the American space program by 2069. It was a promise made in 1960 that before the decade was out an American would travel to the moon and back, and that promise was kept. So with 50, 70 and 100 year rules we can expect more historical material relating to the politics and running of the space program to emerge in 2010, 2030 and 2060 - All of that will add to the knowledge we already have on the subject, some of it may destroy some dearly held truths as to why things happened the way they did. But historically once that information comes out into the public domain no-one can rationally cling to past views or versions that are corrected by the latest information.

The example of "Cats Eyes" Cunningham comes to mind - It is down to him that lots of people believe that eating carrots is key to having good eyesight - load of baloney of course - the story was put out during the Second World War to hide and protect the fact that the Royal Air Force had managed to mount Air Interception Radar sets in their Night-Fighters and now could electronically "see" German Aircraft. Cunningham's success in accumulating his 20 confirmed victories, 3 probables and 6 damaged was published in the newspapers at the time and he was supposed to have attributed his amazing cat-like night vision to him eating carrots - the result was that little boys in Great Britain ate their carrots and vegetables and the Germans were none the wiser until of course they shot down a Night-Fighter on an intruder mission over German held territory and examined the wreckage.