This old interview hit the nail on the head. Especially this.
Quote:
Yet, Adele's singles are still permanent fixtures on the radio, but not in the same way that Bruno Mars and the Black Eyed Peas are, Yahoo.com music columnist Paul Grein said.
"(Some pop artists) live and die by their latest hit single," Grein said. "And Adele, even though she's having big hits, too ... you have the sense that her career probably won't always be as a big radio star."
She could be compared to someone like Sade, he said, "who has had hits, or not had hits, but has sold albums throughout a very long career."
This is exactly what will happen with Adele. She probably won't have many more hit singles after the next album (maybe a few here and there) but she'll continue to sell shitloads of albums as long as she releases them.
People can call her Alanis and Norah but she'll likely end up more as Sade, though held on an even higher level like Aretha.
OMG QUEEN ADELE MUST BE GIVING US THAT NEW LOOK FOR THE NEW ALBUM SLAY ME YOU BITCH! I'm getting all excited over a single picture WHAT IS THIS PICTURE? NEW MUSIC SOONNN YASSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSS
OMG QUEEN ADELE MUST BE GIVING US THAT NEW LOOK FOR THE NEW ALBUM SLAY ME YOU BITCH! I'm getting all excited over a single picture WHAT IS THIS PICTURE? NEW MUSIC SOONNN YASSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSS
She was at the Prince gig last night. Go to my twitter there are more pics
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Please just no 
SLAY ME YOU BITCH! 
WHAT IS THIS PICTURE? NEW MUSIC SOONNN YASSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSSSSS