Yes some online petitions do have results. One of the previous FIFA games (I believe it was 2004) for PC did not have a LAN play option, only an internet online play option. An online petition was started and within a couple months, EA released a patch that supported LAN play.
There was also one for the PC port of Metal Gear Solid 2, the petition was for konami to release a patch that would give support to ATI chipsets and not just Nvidia chipsets(since it was a port of the xbox version and konami was lazy). Guess what, Konami later released a patch that gave full support for ATI chipsets.
But back to the original topic, I doubt a petition for an old game being ported to XBLA is going to be noticed.