Gaga. She most certainly will, everyone has to remember that she trained and studied to be what she is. She's very very intelligent, and as long as the music is good and she NEVER ever does what she did in the BTW album period (ie putting out one single (Judas) and then cannibalising it with single 3). She has the potential to hit Madonna's overall sales in about 10 years.
Rihanna will, but her album sales will get lower IMO, if she keeps doing this album a year thing. I'm a fan, but it's getting irritated, i.e WFL could've been a global summer party hit (which would've helped her album sell more, and become her first chart topping one).
Not sure about Jessie. She doesn't seem to have the star quality aspect IMO. She can sing, and write songs, but I don't know what's special about her ability itself.
Not sure about Katy Perry. She might, but I wouldn't bet on it.
I think leona and Alexandra have every chance, but leona never will if she stays with syco, or if she lets them be the artist instead, compare it to Labrinth, the man is never disturbed and they bend to him (which all labels should do IMO).
Bearing this in mind, you don't need 12 albums. Whitney didn't have 7, and she had mega sales and influence in her career. Whereas Mariah and Madonna have had lots of albums.
We're in an artistic albums age, it's not like the 50s/60s where 98% of albums weren't artistic and only sold 1m nationwide (US sales) at best. The Supremes are an example of this.