Cheryl planning to quit Britain

The Cheryl gossip mill continues to churn out the usually nonsense, after months of will she or won't she go to America the word on the street is that she is to quit X-factor in the UK so she can try and crack America. Assuming this part of the rumour is true the second half of the rumour suggests that Mel B from the spice girls will replace her on the judging panel. I really can't see why Simon would want to bring in someone as gobby and argumentative as Mel B unless he's planning to quit the show as well.