Time will tell, but I think your assessment is off base. It's nice that she has the support of the judges, a few celebrities and a producer, but that doesn't mean that it will turn into album sales nor does it mean she will have a career. Pia has a shot at succeeding if her producer can bring out the best in her and push her, but she needs a lot of coaching. She's also going to need one amazing song to get people interested because she wasn't doing a good job of connecting with anyone.
Pia actually reminds me a lot of a past contestant...Katherine McPhee. I predict Pia's trajectory will likely follow Kat's.
Casey, on the other hand, is ridiculously talented musically and vocally, he has a personality and he's someone I could envision having a real career, one that's more organic. I would be very surprised to see Pia making records longer than Casey.