Many of the desired useful features translate into shortened battery life. If the cameras were powered by a wall wart, then features could be added. Remember something about electronics. When you ask tiny little electronic components to perform magnificent feats, they require energy to do it, and that energy translates into HEAT and early failure of the components.
I wonder … if Blink WERE to add all of the features we could dream up, but it would required SIX D-Cell batteries in a big, clunky black box rather than two AAs in a rather compact unit … would people still buy it?
Maybe Blink could offer the “Stealth” model run by two AAs, and the “Workhorse” model, run by SIX D Batteries to back up the AC power source. The Workhorse could become the ultimate baby monitor or construction yard watchman where it’s obvious presence is not an issue, while the Stealth could hang from a tree limb and watch your motorcycle parked outside of your Motel room in a bad neighborhood.