I agree with what Lucid said:
I really don't rate John & Edward as singers, and I wouldn't vote for them in a million years to put especially themselves out of this misery (I don't actually think it does them any good and is probably more damaging to them than anything else).
Still: They are incredibly young, and the way they are treated by most of the public and the media is appalling. There are even Facebook-Polls to get them out (it is so easy to slag them off if you don't know them, isn't it? How about putting yourself into that position regarding something that's important to you?), they have to read on a daily basis in the papers what nuisance they are etc.
Does anybody ever think about how damaging this is to a young person's self-esteem? Not every young person who acts cocky is really arrogant - it is very often a camouflage for deep insecurities ...
In X-Factor, people get judged by their sob-stories, their past, their looks, a few pounds too much (that poor female contestant who went out at Simon's house springs to mind, being labelled 'fatty' by members of the production team and certain amounts of the public).
You could say: 'If you participate in a show like this, you know what you are getting yourself into.' Sorry, I don't actually think so, I see this every year with students who wish to participate. The amount of naivety (and I mean this in the best possible sense - you probably don't want to know to be totally honest) is actually heartbreaking sometimes.
I had a very interesting email-exchange with someone from a major broadcasting-company after being asked to coach someone on a Glasgow online-format (sort of podcaststyle) - I'll spare you the details, but it wasn't pretty. Don't ask questions, don't think yourself. I guess they won't ask again, thank God I dare say

These are the same kind of people who phone you up one day (!) in advance to train a certain popsinger to sing an opera-aria on live-TV, and then are surprised that you are not jumping at the chance because:
a) you should be thankful for being on TV (even if you hardly get paid more than expenses) - it is such a fabulous advertising tool
b) they don't get that you don't like making an a*** of yourself AND the singer, because they will sound like a strangled cat - which she did, even though they found someone from the RSAMD in the end to coach her. I dare again say I don't understand why, but that's probably down to ego me thinks ('Oooo, look how faboulous I am, I'm on TV').
Good idea to try and make people think you can learn to sing opera in a few hours - also surprising that it obviously didn't work
Whoa, don't get me started

Edit: Do we, especially as music teachers, want our kids (and more and more adults as well!) to believe that this is what music is about? That this is the right way into the music business, and that being a musician merely means presence in the media? That everyone who can belt out a few half-decent sung notes can and should be a popstar a couple of months down the line, with all the pressures that come with it (which nobody prepares them for)? Being a singing teacher, I sometimes really feel trapped between being supportive of what my students want to do, and trying to get them to see the bigger picture.