Beyonce could easily make an album sell 10 million WW if she promoted.
But someone like Adele promoted less than Beyonce, and sold nearly 30 million.
I think the next era depends on what Beyonce wants. Self Titled was important to her career because it turned her into an hipster and bolstered her Instagram/Tumblr impact. If it was a blockbuster success, that may have not happened.