Thanos culled many lives with his crushing snap in Avengers: Infinity War, and the Asgardians were no exception. With popular new characters from Thor: Ragnarok like Valkyrie and Korg missing from the devastating opening of Infinity War, it would appear his 50/50 ideology spared them. The fate of the missing Asgardians was later confirmed by the Russo brothers, so we know they're out there somewhere.
What does their survival mean for the future of Asgard, and indeed the future of the Marvel Cinematic Universe? Displaced without a realm following Ragnarok, and without the colony ship they were traveling on, where will they reside when the dust settles?
Able to hold her own alongside Thor and Loki in Ragnarok, Valkyrie could be a powerful ally for the Avengers going forward. Her comics counterpart has been part of the Avengers and the Secret Avengers, so she has slotted into the team before. However, with a large portion of the Asgardians left to fend for themselves in the universe after Thanos' attack, they'd need a worthy protector such as her.
If she does manage to seek out Earth's Mightiest Heroes, will they be able to help solve the issue of these people not having a home of their own? While it could be argued that a livable planet could be found for them, it would be much safer to re-home them on Earth.
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It wouldn't be unfamiliar territory for Thor's people to have to make a new life on Earth. It happened in the comics, too. Although, in the source material, the entire main city of Asgard was relocated to Midgard, floating above rural America. As with any large and sudden influx of refugees to a country, the Asgardians' appearance on Earth proved difficult.
Though still able to govern themselves, they had to make agreements and receive supplies from the United States. Unfortunately for Odin's nation, they made powerful enemies due to their need for resources, raising the ire of Norman Osborn, the director of H.A.M.M.E.R. at the time. Replacing Tony Stark and S.H.I.E.L.D. following Secret Invasion, Norman used his new power and influence to get rid of those who didn't fit into his plans for America, which included mutants and Asgardians.
The tensions between the displaced Asgardians and the U.S. government saw Earth's heroes caught in the middle in an event known as Siege. The last time the Avengers were tangled in a divisive issue involving the government, they were split down the middle in Captain America: The Winter Soldier. Though they will need to be more unified in the aftermath of Endgame, we may see them take sides once more.
One of the issues faced was that Asgardians were far more powerful than humans, and when they tried to be heroic, they caused mayhem. Not used to how fragile Earth's people and buildings were, one of the Warriors Three, Volstagg, accidentally caused mass destruction across a city while trying to apprehend some criminals.
The Siege storyline also takes place canonically after Secret Invasion, which the MCU appears to be building to with the appearance of Skrulls in Captain Marvel. Issues between Earth and displaced Asgardians don't end there, though, as Odin's sinister brother Cul Borson was once imprisoned beneath the sea. In Fear Itself, he was freed by Red Skull's daughter and almost razed Midgard completely.
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Another villain who helped release Cul in Fear Itself was Baron Zemo, who we haven't seen since the end of Captain America: Civil War. Though Asgardians are usually allies to Earth, if they were to move there permanently, their problems would become humanity's problems. Let's hope Ragnarok, believed to be a cycle, doesn't happen again on Earth this time.
People without a home, the Asgardians could be the focal point of several storylines, and even if their displacement becomes a running side plot, they will still play a major role in the universe at large. With big characters like Valkyrie and Korg among them, they could provide a much needed boon to the diminished Avengers going into Phase Four.