Microsoft have touted their new Surface Pro 3 as the only device you need to carry. Their main comparison at the launch event was that you no longer need to have a Macbook Air & an iPad in your bag.
Their main focus is on making one device that you can use for everything. Is this what people want? Typically when a device tries to be & do all things, it does nothing particularly well. It is when a device is designed & developed with a focus that it becomes great. Look at the Kindle Paperwhite for example.
I want the best device for the task, not one average device.