Comment by plorkyeran

To some degree there simply isn't any plan you can have beyond that in the short term things will suck and hopefully the long term benefits will be worth it. If the existing incumbents are sufficiently ideologically opposed to your goals that they'll refuse to work rather than let you even inch towards them, there's not much you can do beyond try to replace them with people who don't have the relevant experience but are willing to work with you.

"Defund the police" didn't poll well so the progressive prosecutors who actually got elected were the ones who didn't admit that they were going to have to tear things down and start over (and maybe they didn't even realize it), but it was a very unsurprising outcome.