The influential secret Society of Hydra, as shown previous seasons "Agents Sh.I.T.", existed for thousands of years. It was very difficult to destroy it, but suddenly it turned out that, if you do, the whole story Marvel collapses like a card house.
In the seventh season "Agents Sh.I.T." The audience saw that, no matter how evil was hydra, the organization is the most important part of the Marvel timeline. In response to the emergence of the Nazi scientific division, the US government has formed a strategic scientific reserve, thanks to which, in turn, Captain America appeared.
In 1948, this organization was renamed "Sch.I.T.", and at the same time received an extended sphere of influence. Working in close collaboration with Howard Stark, "Sch.I.T." For decades, it provided an incredibly high speed of technological development and helped introduce various innovations.
Also, the Agency during the Cold War joined the efforts with Hank Pim, and in the 80-90s collaborated with NASA, which ultimately led to the emergence of Captain Marvel. So, it turns out, do not be in this world of Hydra and organization "Sch.I.T.", the whole story of Marvel would have formed otherwise and the Avengers would never come together.
Tony Stark would not turn into an iron man, continuing to burn her life, the falconian would not get the opportunity to work with a black widow, and she would most likely, in the end, would just be killed. On the other hand, with such a situation, the Loki would not have seen a tessrakt, which means that the Earth would not be attacked by the troops of Tanos.
It turns out a hydra, which believed that forms the history of mankind, to some extent was the right. The Marvel Universe has become the one that the fans know it, it is because of the existence of this organization, but not under its leadership, but rather due to the world's reaction to the events provoked by it. Therefore, it is not surprising that the Chronicles guessed that to destroy all their enemies it would be enough to strike a hydra from the history of the world.