Well, his campaign worked.
Here's a note from Seth,who started the petition:
To all of you who signed the petition, Google has implemented the change we requested! Take a look at Chicago under google maps, and select "transit" to see the L rendered in shiny, correct colors. Also note on parts of the system where more than one line converge, the individual lines have been rendered side by side (for example, in the Loop).
Thanks again for your participation - you have helped support public transportation in Chicago.
Way to go Seth, and all who participated.