Don't think a petition will be any use. This guy seems to do what he wants say what he wants with no regard for young players. I do recall him being the first guy to have a problem with Stephen Ireland. Maybe he'd still be a part of the Irish set up still if givens hadn't planted the seed to let the rot set in.
But the fai seem to be more than happy with him so all the petitions in the world won't shove him. If the media started to put some pressure on the association they might feel the need to do something. But with the coverage u21 football gets in Ireland this seems unlikely