The novel stresses that while all three powers (Oceania, Eurasia and Eastasia) are in a perpetual war against each other, none of these three powers believes that victory is possible nor wants to achieve it. Instead of victory, all powers want and need perpetual war, as it allows them to:
- keep their people in poverty by spending surplus resources;
- implement population control by sending suplus people to death;
- keep their population in a state of a constant patriotic histery.
However, the novel also stresses that the Party's actions are fueled by its desire of power and that it desires power only for its own sake.
But, the Inner Party still consists of its members. So, ultimately, we must conclude that the whole system is founded on, and dependant on, Inner Party members' lust for power.
The problem with human lust for power seems to be that it never ends. Usually, the appetite grows with what it feeds on. In the novel, it is already shown to be of monstrous magnitudes; so I think it is unlikely that the Inner Party members (or the Inner Party itself) would be themselves able to curb it. Doublethink and similar devices of mind control seem unlikely to be helpful here, since they themselves exist only because they are deemed necessary to satisfy this enormous lust for power.
In the end, I fail to understand how can the regime tolerate the existence of two opposing superpowers. The Party clearly wants to control everything, even the reality itself; yet it cannot, nor does it want to, control two concurrent superstates?
I would rather imagine that this state of perpetual war cannot last forever. Sooner or later, in one of the three superpowers, the lust for power - the true root of their totalitarian regimes and therefore, the only thing that cannot be controlled by these regimes - will just grow out of control. Sooner or later it must cause these states to try and grasp absolute control over everything, including the concurring states. Sooner or later, regardless of what O'Brien says, these superstates must either evolve to no longer have their policies dictated solely by an unwiedly lust of power (but then they would cease to be totalitarian to such an extreme), or succumb to their lust of power completely, and go to an all-out war for absolute world domination.
How can the Party not desire to extend its power over the concurring states? How can the perpetual war, in which no participant tries its best to break the equilibrum, last forever, as the novel says it will?