I kinda expect Helmut Zemo to be the surprise hero who saves the day and uses the Cosmic Cube to restore everything to place. Even if he was a bad guy, he seemed to have moved beyond the fascist/nazi stuff and become a more Doom-like "I want power to make everything right" kind of villain. Even if he would like to rule America as an authoritarian state, I doubt he buys the Hydra ideology crap Madame Hydra has been spoon-feeding Steve, and he is smart enough and has enough knowledge to notice the bullshit...
Don't get me wrong, he IS a bad guy, but he would rather use the power of the Cosmic Cube to conquer the world directly, rather than mess with the past in order to make Steve's illusory past real. I doubt he wants to have his memories and past rewritten in order to become the fake fantasy version of himself who Steve believes is the real Zemo, and I doubt he is on board with whatever weird mystical crap hardcore Hydra members like Madame Hydra and Von Strucker and Kraken and Gorgon and the Hive have been planning for long... (I don't know what it is, but I bet in involves tentacles...).
Mmmm... I can see it go thee ways:
1.-Reality warping, time travel shenanigans or mass brainwashing thanks to the Cosmic Cube. The lack of dire consequences is justified, but it reinforces the feel that nothing that happens matters, no matter how extreme, in the MU. I'm not sure that would be good so soon after the massive Secret Wars reset...
2.-During the final battle the heroes ask the normal citizens to help them, and common people go out to fight Hydra mooks wielding shotguns and baseball bats, and afterwards they can feel good about themselves, redeemed and united. Problem is, there must a ton of policemen, judges, journalists, soldiers... etc., who are actively helping Hydra opress their fellow citizens... should they be easily forgiven if they change sides during the last minute? And it seems there are many people who are loudly supporting Hydra on their own will... will everybody become amnesiac? Because otherwise, that should provoke a permanent split in American society; people would remember who was an Hydra supporter for decades...
3.-Marvel just ignores the event for the most part, and moves on to the next big thing, which is so big and threatening that people can't stop even a second to think about Secret Empire.