The implementation for this feature extension has been merged: feat(sns): Enable automatic advancement of SNS target versions for newly launches SNSs by aterga · Pull Request #3901 · dfinity/ic · GitHub
This change will be proposed on Friday, and the voting will take place (up until) next week.
Please check the discussion on the pros and cons of automatic SNS target version advancement: Proposal: Opt-In Mechanism for Automatic SNS Target Version Advancement - #9 by aterga