Oh this is something I'd love to see.. or at least, fines for dropping it in the street or sommit... I hate to see those little black dots all over our pavements, and even worse when I get it in the tread of my shoes and end up having to scrape it off at the kerb or pick it out with a penknife...
I'm not against chewing gum per se... chew it myself quite often, but I dispose of it carefully in a bin, wrapped in the wrapper or a bit of newspaper or something.. just not thrown on the ground for any poor person to walk in.