what is not to stop states from restricting where conceal carry can be legal to the point its overly restricted and almost useless ??

The state I live in is that way now (Illinois) there is so many no gun zones in communities like parks and buses and all mass transit, rest areas on highways and other areas all out side entertainment such as parades, carnivals/festivals, fairs, about any where a large group of people would be gathered .... many of the places restricted are where you might want to most carry ..

I can hear the cries of the anti gun crowd now !!!