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Because if everyone in the pool is a pool hopper, the pool will die the first time it has bad luck. If every miner will only mine when the payout is more than he could get from a PPS pool, as soon as the payout is expected to be less, nobody will mine and the pool will die.
That is really unlikely. First because not everyone in the pool is a pool hopper - at least the pool owner is not
. Second, pool hoppers have a great incentive to keep a pool alive if they have invested time in it. IMHO, the whole "pool hopping is cheating" argument seems to don't take in account the power of economic incentive...Besides, small pools might benefit from pool hoppers in the first place, since, at least for the time they hop into it, they might have more mining power than they would ever get otherwise.