I don't think the reason you don't see planes in people's driveways is because of their complexity. Nearly all consumer products are increasing their complexity

I don't think the reason you don't see planes in people's driveways is because of their complexity. Nearly all consumer products are increasing their complexity each year and there's no reason to think that this trends stops. Just take a look at any modern car and compare it with an old one. If people want such robots enough those robots will be produced for the mass market. And the first application which did spring to my mind immediately was transport. There are so many situations where an automated transport, which does not depend on wheels or rails, would be useful that I can see a huge market for this. The first mass market might be in the industry. But once prices fall there are also lots of possibilities for this to reach the consumer market. Certainly normal people also can have uses for such transports. Be it as intelligent luggage, as a tool for the garden (replacing the wheelbarrow) or simply as a very cool toy for the kids (just think of riding those things!). This is a completely new way of automating transports and so I expect it to have an extremely large impact in the following years.