Cant be bothered signing it as these petition's never do anything.
At the end of the day, as the main British PSB, the BBC are in a position of trust and have a strong influence upon society. If they and/or the government deem that Top Gear is no longer suitable for thier programming, due partly to recent events, and partly because of the amount of disapproval from government ministers and officials in the past, then a stupid petition isnt going to change this.
Power to people you may think, but the people in this country have no power whatsoever, a fact strongly highlighted when even Ask.com didint take any notice of the "Save Jeeves" petition.