Does any law stop people from committing crimes?
No, but It’ll make it much easier to charge the ####suckers. When caught they will no longer be able to play dumb.
You seem to like no trespassing signs. You seem to think the expense of installing and maintaining them is not a problem. I suggest after the trespass law changes that you install and maintain open access signs on all of your property, then everyone will be happy. Problem solved!
Tons of jurisdictions use different posting methods such as painting trees or fence posts. This is by far more effective and much harder for azzholes to mess with. In some states, painting every few fence posts or trees with purple paint (or other colours) is sufficient.