The 'temporary' framing is worth examining through incentive design. Any restriction that requires periodic renewal creates a recurring political surface area — each renewal becomes a new consensus battle. Meanwhile spammers adapt around the restriction immediately because their incentives don't wait for governance cycles. The real question is whether the precedent of restricting valid transactions is more damaging long-term than the spam itself. History suggests once you normalize filtering at the protocol level, the definition of 'spam' tends to expand.