I don't know if we need to build "The Smart Home of the Future ... Today!", or any kind of item you can name in place of "Home" there - car, bike, kitchen, fridge, whatever. I think we're just going to keep making things a little bit smarter as time goes on. Cars are getting self-parking routines built in now, and it doesn't seem like it will be long before they're driving themselves in some places. Houses are getting smart appliances like self-learning thermostats, programmable light switches and power points. We will keep building these devices and attaching them to existing infrastructure, and the best ideas will be built in to the next generation. Going whole-hog from the beginning seems like a recipe for over-complication.
What we should do, as much as possible, is to build our homes, cars and other devices or structures with the capacity to be improved, to add on, to upgrade. Ease the transition into the future by allowing today's devices to be tinkered with.
Of course the flip side is maintaining security, which is another problem, often with conflicting demands.
Mokalus of Borg
PS - And history has shown that erring on the side of convenience over security will bite you in the end.
PPS - We need adequate security when our very homes and cars are online.