Aether is consumed and renewed with time as part of the cycle of the world. Even if the old world still existed, which it doesn't, the aether wouldn't be the same. Moreover, it's confirmed by Venat herself you can only look so far back with the Echo. The further back you try to peer, the less reliable it becomes.
What matters is the direct implication they didn't actually try to prevent the summoning in the first place. We're told quite clearly Venat did not decide to take action until after Zodiark was already an element, despite having all that foreknowledge. We're also quite aware she was acting in full knowledge Zodiark would be an absolute necessity for the planet to have any future at all, let alone the one she'd been told of.
There's evidence the ancients were in the midst of developing space travel. The ancients kept their different sciences separate for the most part, meaning a group working on a project in one field would not necessarily know about projects in other fields, let alone about how progressed they are. Hermes had area of expertise, and in that he created the Meteia. Other ancients worked in their own areas.
Problems tend to be a lot easier to solve if you know the cause. This information is oft times vital not only in the process of resolving the issue but in the speed with which you do so as well as the efficacy of the solution chosen. Working in ignorance, on the other hand, often leads to temporary solutions with a number of negative side-effects. Frankly, the fact the ancients managed to come up with a solution at all under the circumstances is fairly impressive.



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