Barnes & Noble has an exciting future ahead as they expect to see a rise in e-book sales from $250 million in 2010 to over $2 billion in 2015. Unfortunately for Borders, Barnes & Noble also expects the closure of Borders to boost store sales between $300 million and $400 million annually. Kinda’ stinks that it had to work out that way, but who knows, maybe Borders will come up with an e-book company that puts B&N out of business. Oh, the irony…