"As for constructing a Cosmic Ark... it might require the sacrifice and entire contribution of all Ninth Level Universal Civilizations and all Deities from both camps combined to potentially create an exceptionally small Cosmic Ark, and the number of lives it could carry is quite dismal."
The two teams had long anticipated this.
The meaning of the contingency plan is to resort to extraordinary measures when a certain level of circumstances is reached, making it unavoidable.
For example, a fire contingency plan in production, an earthquake contingency plan in a city, or even a war contingency plan between nations are all for addressing extreme situations and cannot be considered routine actions.
Therefore, the four major contingency plans proposed by the Two Camps were in essence either unattainable or amounted to mutual destruction if achieved. Comparatively, the Mending the Heavens Plan appeared more reliable.