It's quite simple. B&N stops their failed Nook project and sells Kindles instead.
Selling Kindles wouldn't save B&N's brick and mortor business. With the industry changes currently underway, what's likely going to happen is a "next wave" of book stores and libraries which look nothing the current ones. B&N stores are going to shrink for a while, and when the "next wave" emerges - whatever it looks like - the B&N brick and mortor business will go belly up.
The bottom line: the number of times my district manager came into my store to meet with me and discuss sales = 0. The number of times I had to listen to her crap on about useless operational garbage = uncountable.
I took one class on Operations and a couple where metrics was briefly a topic. Point by point, they basically said not to do all that. I feel for you because that's crap.