People have a real tendency to hyperventilate about computer devices converging. Years ago I was reading about the glorious future when TVs would have converged with gaming consoles, laptops, desktop computers, and DVD players. Ten years later, and we still have separate boxes for all those things. Why? Because CPUs are cheap, and each of those devices appeals to a different market.
Nowadays, the iPad is the thing which everything "obviously" has to converge with. However, the reality is, people like their separate boxes. Tablets don't have a one-month battery life. They aren't as easy to read as eInk displays. A software update will not fix these issues.
Someday, some physicist will invent a screen that looks as good as eInk, but can play movies. At that point, eInk readers will die, and the tablets will take over. Until then, talk about convergence is just more hot air in an industry that already has several hot air balloon's worth.