Surely you read too much into the statue. The statue is cold and dead like the Septims. This is not the covenant between Akatosh and Lorkhan with Alessia, but its end.
Alessia, as the myth-echo of Mundus, manipulated Akatosh and Lorkhan with a covenant agreement, to maintain a stable world for her progeny. That covenent was the Amulet of Kings, and its purpose was to prepare a space in the mythic for Talos, by myth-echoing the convention and the space left with Lorkhan's death.
That is why the Amulet's Tower was the hub of a wheel, to model how the Enantiomorph cements the Mundus. The Many Headed Talos, being the Enantiomorph, was also the hub that held the two together. Again, this was the purpose and missing space left for him. However, with the Amulet broken, Talos is likewise broken, and the center which cannot hold is undone.
"To kill Man is to reach Heaven, from where we came before the Doom Drum's iniquity. When we accomplish this, we can escape the mockery and long shame of the Material Prison.
"To achieve this goal, we must:
"1) Erase the Upstart Talos from the mythic. His presence fortifies the Wheel of the Convention, and binds our souls to this plane.
"2) Remove Man not just from the world, but from the Pattern of Possibility, so that the very idea of them can be forgotten and thereby never again repeated.
"3) With Talos and the Sons of Talos removed, the Dragon will become ours to unbind. The world of mortals will be over. The Dragon will uncoil his hold on the stagnancy of linear time and move as Free Serpent again, moving through the Aether without measure or burden, spilling time along the innumerable roads we once travelled. And with that we will regain the mantle of the imperishable spirit."
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While the Septim Empire is over, Cyrodiil has recovered from it much more quickly than when the Reman and Alessian Empires fell, and it appears that it was Martin's sacrifice that made this possible.
In fact, the Oblivion Crisis itself may have spared Cyrodiil from going the way of the Reman Empire, as it brought the nation together just as they lost the last of the Septims.
Cyrodiil is saved? Tell me, was Vvardenfell saved? The Tower was destroyed through subterfuge and provocation, and you don't admit it. I suppose a giant city needs to fall on top of White-Gold before more see Talos is dead.
The Nine FAILED! YOUR GODS FAILED!! Matin was had, like the rest of you.
[sorry for jumping in and out of character guys]