Barnes and Noble should ideally end the entire Nook business as well. Every month I spend around $50 buying books at a physical B&N. I am just happy to buy their books on a standard Android App. Not sure what purpose the e-reader serves.
Carrying around hundreds of books is the obvious killer feature.
Better indexing and search would be the killer killer feature.
I carry about a hundred books and about that many magazines (in PDF). Being able to search through that stack would increase my perceived IQ by a hundred points.