Then you'll have people not registering their cars. Which already happens a lot. They steal a plate or renewal sticker from another car or just drive with it expired.
Maybe. I see cars driving around without any visible plates at all sometimes, and they don't seem to get pulled over. Traffic violations seem to be the lowest priority for cops the past few years.
I think if you're the sort of person who would drive with a suspended license you would also drive with expired plates and no insurance.