might I also add, it's not JUST the fact that adele is white why she's so successful. she writes her shit and has a story to go along with it. She speaks for the heartbroken and isn't afraid to push the envelope with the "asshole you hurt me" type shit. lots of female artist really try to follow the "female empowerment" route while Adele is perfectly fine talking about how fucking hurt she is over and over and people gravitate towards that.
not to mention, she's very down to earth and very IDGAF this is me. she's very authentic. though majority of her fan base is probably white, many colored people purchase and support her as well. You're right, if Jazmine Sullivan or someone were to sing "Hello" it probably wouldn't do as well but that's not just because of the skin color. it's more to it than that. Adele has a niche and she's comfortable in it and she owns it. her voice, her charisma, her artistry >>> skin color