PoX can't occur unless the network is sufficiently stable. The only way to get PoX to start for a reward cycle is to confirm a PoX anchor block with 80% confidence within a 100-block window called the "prepare phase." Miners collectively determine the anchor block when they mine blocks that descend from it -- if PoX begins, there will be exactly one Stacks block in which at least 80 of the 100 sortitions in the prepare phase are its descendants. By deciding on an anchor block, miners collectively determine what the PoX reward set will be. But in order to choose an anchor block, they have to have it in their chainstate; otherwise, they'd be unable to mine a block that descends from it. Miners don't know what the anchor block will be until the end of the prepare phase, so this means that they need all of the Stacks blocks in order to begin the next PoX reward cycle (since any Stacks block can be the anchor block -- even one from many reward cycles ago).
At the same time, because Stacks blocks are stored a
