Ode To Banks
As long as the "drone" is shaped like a small suitcase, and can deploy monofilament wires and/or semi-sentient knife missiles against the aforementioned pedos, put me down for that Kickstarter when it appears.
For the nanny use-case, won't be long before tech-savvy littluns can hack them out of the sky and escape their watchful eye-cams, according to some recent Reg articles...