That's what I've been saying. Her success is phenomenal, yes. Her next era will be big too, just based off 21 (see queen Norah getting 1M first week on her follow up). So when it comes to the one after that, then we'll know if she's here to stay or not. As of right now, she hasn't proven that yet, which is why I think the Daydreamers* sound just as silly as the Monsters did when they act like Adele is the end all, be all of music for the rest of eternity.
And I don't think Skyfall being a soundtrack song is a good excuse. Some of the most iconic songs ever are from movies. She should've had BTW (single) level sales or better based on how colossal 21 was (or something with similar hype leading up to it).
*edited to reflect new information I received