If this is the miraculous fruit of the consecration, it hardly seems worth all the hoopla.
Firstly, I have seen it reported from different sources that "In Portugal the dogma of the Faith will always be kept." is not a complete sentence. Therefore instead of a period it should have ... at the end.
I think this is the root of the problem with trying to be faithful to the message of Fatima; we don't have the full message.
To your first point, the Secret was absolutely terrifying, so much so that Sister Lucia became physically ill trying to write it down. There's much more to it. It has to do with the Apostasy in the Church "starting from the top" (Cardinal Ciappi, who read it). Western Intelligence concluded in 1974 (per Fr. Hesse) that the Communists had planted 3000 men / agents into the Church hierarchy by that time. Bella Dodd, who was a Communist agent converted by Bishop Sheen, admitted to having planted about 1200 of them herself, and this was well before Vatican II, and stated that many of them had reached the higher parts of the hierarchy. In 1958, the Communist agents within the Conclave ousted the legitimately elected Pope Gregory XVII (Siri) and placed Komrad Agent Roncalli on the See of Peter. Montini was ratting out clandestine clergy behind the Iron Curtain, who were then arrested and/or executed. While "pope" he publicly wore the Masonic "ephod of Caiaphas". Wojtyla was hand-selected by the chief Commie official in Poland to become a bishop and was always suspected of being a Pax priest, a collaborator; while other Catholic clergy were under house arrest and/or being tortured, Wojtyla was on a worldwide lecture tour. THIS is what's meant by Russia spreading her errors around the whole world, here into the very bosom of the Church.
As for the dogma of the faith will ALWAYS be preserved, I hold that the translation (as in most Romance languages) means that it will be preserved continuously (or will continue to be preserved) ... UNTIL (the etc. part). That's why the next part is truncated, since it clues into the main content of the Third Secret. There's a subtle hint even there that this pertains to the "dogma of the Church". We're not talking about simple heresy, but about "apostasy".