I see your point, but Madonna has more talent and just used her body to get more publicity, but would still sell records without showing all the skin.
It's harder to get somewhere without the base talent and just looks, No offence to Christina, she's hot, but I don't know what talent she has. There's a ton of hot girls like Christina out there that can dance in a see through shirt as good as her.
Only time will tell if she makes it.
I do hope she does well and keeps her expectations within reason.