I personally don't want them gone nor randomized. You should just randomize the people with the ridiculous plates, but why should people with a acceptable plate be punished.
I have a reasonable idea for this:
Make the plate customization to be confirmed by admins. Just like /changemyname, in DMV there will be /changemyplate.
The plates will be evaluated by admins and the acceptable ones will be applied.
I have seen people ride with plates like UJELLY, or UMADBRO, or UMADNAO, or FAILBRO or any kind of shizzle like this.
My Savanna has LOWRIDA plate on it, and I consider that appropriate.
If you think we should have /changemyplate in the DMV and requests confirmed by admins, /support this idea. This is the only way to avoid a wipe. As to the people with ridiculous/non rp plates, their plates should get randomized or they should ask an admin IG to change it to something more sensible.
That is my 2 pennies.