These guys continuously move the goal posts. Once you bring up the fact that spammers are not going to voluntarily pay more to stuff spam in the OP_RETURN they shift the conversation.
Discussion
How so? The observation that OP_RETURNs are more expensive for larger data payloads has been a central argument why "spam" is unlikely to increase overall by this change.
Spammers are not going to stop using SW for OP_RETURN. The UTXO sets will continue to bloat.
The only things this change will do is help spammers propagate their spam and create new types of spam.