@Bitcoin Mechanic, to expand on my last comment: the need for it to be temporary seems solely tied to the desire to disable unused segwit versions. I think there is a good case for not doing that. Specifically, policy already filters these transactions. If, as @Dathon Ohm is anticipating, spammers start using unused segwit versions, a successful soft fork would force Core’s hand and make them adopt the traditional stance on filters, if only to protect upgrade hooks. What are your thoughts on this?