I want my computer assistant (device) to always be on and watching and listening to what is going on. I want it to identify me by voice and face, and learn who other people (and animals!) are. It needs to interface with devices around me (communications, car, lighting, heating and AC, etc.). It needs to know where I am at all times and go with me everywhere.
We have the technology for all that and we can make it secure. I hope we don't have to wait too long for it to all work well. Microsoft seems pretty far down that path (farther than anyone else), but it isn't quite all there and working well enough to really be effective.