Well, a little more nuanced than that. I'd argue the convenience of getting books at the touch of a button outweighs some of its inconveniences (battery, etc.).
I don't particularly experience the inconveniences since I like going into bookshops and usually have a backlog to read. I still have the kindle app and a few kindle books for the occasions when they are useful. The real killer for me though is that at least a third of the books I read are lent to me by a friend, and most of the books I buy are shared on. Kindle doesn't really support this, and that makes the economics of ebooks rather poor for me.