Okay...you're saying the world is f--ked up because ADELE is popular?!
I'm sorry, but that's a bit comical. I agree with you 110% in that there are many albums which are definitely MUCH better than Adele's, but she is very clearly the least of our problems when it comes to inflated/popular artists without much talent whose music is more popular than that of worthier candidates. Society should be slitting its figurative wrists over the fact that Justin Bieber, Lady Gaga, Katy Perry, and Rihanna are extremely popular despite the fact that there is an entire plethora of artists a million times more talented and relevant than they are--THAT, my good sir or madam, is something worthy of collective despair.
Adele, while she might not be exactly whom I think of when I think musically brilliant, at least has some discernible talent and does not have the compulsion to strut around half-naked or sing raunchy lyrics to get people's attention. I am of the opinion we need someone like that to stick around and even the odds, as they say.
She has enough talent to not fade away soon, I think. As for why people support her instead of supporting the other 108 best-selling albums of all time, I think it's because people want something current and new. I'm willing to bet a lot of the albums in the higher-ranking positions are a bit older than the people you want purchasing them. People also like artists they can relate to, which is why a lot of the really out there artists have smaller fanbases, and the faux artistic but really quite pedestrian ones [i.e. Gaga who likes to pretend she's edgy and different but actually sings about the same things as/thinks like most of her pop music peers] enjoy immense popularity.