Simon, It doesn't mean that The Voice is working just because they have Christina Aguilera will automatically mean X-Factor will work with Britney Spears on it. It's all about flatform and the Voice has the best flatform compare to AI and X. That is actually the main reason why The Voice is working. Although I love to see britney on TV regularly, if i wer her i won't do it.. Not with X-Factor.

BTW, Simon is getting Boring and is overrated thats another reason why his show is not working anymore.