Let's put it this way.

We now know the point of Dalamud was to channel the energy of the sun into the Crystal Tower by using Bahamut. Mr Big Bad Primal would soak up the energy (aether - all energy is aether, aether is energy and E=mc2, thus aether is convertable to matter) radiating through space and spit it down into the Crystal Tower like a collector dish 24/7.

Problem and Consequence: The Alagan components have been displaced. The intelligent Automated Defence Systems of the Internment Hulk have continued to perform their intended task by seeking out and containing their target while keeping it on life support with artificial worship* and free from external harm. Meanwhile, Bahamut no longer feeds on solar energy, so is left to nom on Hydaelyn's aether. Oh bugger. With no clear path to the Crystal Tower collection dish, Bahamut will keep that aether thank you very much. And so the clock is ticking... what is another 10 years of regeneration to an entity that has waited for millennia?
This is likely the conclusion that Alisae and Urianger have come to as they seek to disable the internment hulks.

*This is its own can of worms. Odin seems to keep coming back despite a lack of devotees summoning him forth. Chances are Bahamut similarly doesn't abide by those rules either, so the assumptions our friends make may be cataclysmically flawed.