Absolutely.
Venat's choice was not smart, it was emotional.
We know zodiark would allow them to survive and research dynamis for literally THOUSANDS OF YEARS, the moment they know what causes the final days is the moment the ancients could figure it out, after all we are talking about immortal beings with the power of literally creation. And with their very scientific focused society multiple solutions would present themselves in time.
It makes no sense that literally every single ancient lost 1000 intelligence and stopped caring about what caused the final days and started going desperate, especially after the VICTORY of stopping the final days, some like hermes were clearly emotional lost causes but many more would be interested to learn what caused the final days, Zodiark simply stopped it but even for historical research purposes people would want to know.
So even without time travel shenanigans an ancient scholar would try to figure out what happened, which would inevitably lead outside the planet and try to find energies that are causing this.
For good or ill the devs have made the ancients literally overpowered, not only ability or immortality with but even their society is focused on improvement and research, it makes no sense for such people to just beat a huge problem and suddenly fall into an emotional depression, keep in mind that they can live for thousands of years so they see time very differently, meaning waiting a couple of thousands of years to meet their sacrificed friends wouldnt be a big deal.
I honestly wish we get a timeline where we join sides with Emet Selch, realize his arguments are right and go against the more emotional scion team, would even be interesting, the WoL going against the scions xd