Why? Pickler does Country and some other styles very well. I think she would sell a ton of albums, and would have a popular acting run to boot. Meanwhile, where is Fantasia? Nowhere.
The idea that the Gerkhin would sell a ton of albums makes me grit my teeth until the enamel is in danger, but you may be right. However, I think your more salient comment is the one about Fantasia. She certainly was not a stellar winner, and her career so far has been lackluster. Perhaps you are right, and it does take more than a so-so winner to make AI jump the shark.