Mayor Breed publicly directing SFPD to prioritize traffic enforcement — and specifically Focus on the Five violations — would go a long way.
Additionally, she (or the Board of Supervisors) could threaten to shift SFPD funding to unarmed enforcement and/or SFMTA for infrastructure improvements.
Either (or both) of those would likely motivate SFPD to start doing traffic enforcement.
Mayor Breed has a lot of sway with SFPD, but has shown no sign of putting pressure on them to actually do their job, so I'm not holding my breath.