She's reportedly singing with Eminem this week, she will be shown just how bad she is tbh.
She will indeed be bad, compared to Eminem, but then give Cher 10-15 years to refine her "art" (as Eminem has had) and I have no doubt that she will be doing a good job. The plus point with Cher is that she can rap AND sing, mixing the 2 together. Eminem only raps.
You focus way too much on vocal quality. The top selling artist over the last few years is Lady Gaga and she certainly isn't the best vocalist out there, yet she has a certain something, which attracts people to her. She is different and unique. Cher can also be different and unique, but she will need a strong marketing team behind her, to work on this area.
A lot of people seem to compare an XFactor contestant, still trying to win, with an established artist. This is totally wrong. You wouldn't compare A.Burke while she was still trying to win the competition, to what she is now, as she has now moved on and improved. JLS are the same and in their current form/ability would easily win most XFactor finals.
Cher is the only artist, the likes of which XFactor has yet to see. This is the only reason why I believe the Cher has a chance to make a career for herself. The big problem for her is that the votes are going against her, which shows that the public, for whatever reason, just don't like her. This means that her marketing team will need to re-invent her (perhaps give Cher some lessons in humility). If they successfully re-invent her, there are MASSIVE possibilities for Cher. Cher cannot make it on her own and like any other successful artist (B.Spears, Spice Girls, Lady Gaga, etc), will need a VERY strong marketing/management team guiding her.
Justin Beiber was someone who was totally unique, in that he almost didn't require any polishing/re-inventing and was likeable from the get-go. He already had many fans when people saw him sing on youtube. Very few people are this lucky.
Rebecca is unlikely to get a long-term record contract, if only because she is going to be weak at selling herself and putting herself out there (something that Cher and Katie are very good at). If Rebecca has a personality transplant, then she has a chance.
Matt Cardle is the big unknown. I was watching the biggest hits of XFactor winners a few days ago and Shane Ward has done VERY well. In fact, I think he is the most consistently successful XFactor artist over the last few years, where he has had many many hits. My reasoning is that if S.Ward can do it, then may Cardle can do it as well. It remains to be seen if Cardle is prepared to put in the hard graft or not.
I can't help feel that a lot of people commenting and berating XFactor singers are not in touch with chart music and music which is selling. I'm sure most have no idea of which single is currently No.1 in the charts and outselling every other single in the UK.