If, hypothetically, the war ended tomorrow, then we could resume Business As Usual and slowly start rebuilding reserves. The Powers That Be (governments, oil corporations, etc.) have a vested interest in this: while a price spike ostensibly makes money for the oil corporations, it also drives people to invest in green energy, buy electric cars, or make lifestyle changes that reduce long-term consumption. Meanwhile, the politicians benefit from the illusion that everything is under control.

There are still enough reserves to maintain this illusion AND do a fairly orderly "jack up prices, drive down demand" transition if and when it proves necessary.

TL;DR: The whole point of these reserves is to provide this sort of stability