In fact if you are already scanning the environment with a galvanometer for things like obstacle detection then you only need to point an extra laser to the rotating mirror and synchronise it. So for an extra buck for the laser pointer, you could have something like this : https://www.youtube.com/watch?v=pmRfDEhTeYg
The "priority" boarding on budget airlines is already like that and I'd be surprised if there isn't already a "VIP priority" boarding for an extra fee.
In the longer term though, I wonder if we could have mobile (robotically operated?) kitchens, optimized to finish preparing the dish just as they're about to arrive at your doorstep.
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What they might do though is play with the route. Say I tell my self-driving car to take me to the grocery store. There might be several routes it can take. It might infer from the destination that I'm going to buy groceries, and purposefully pick a route that takes me past billboards that advertise for things at that store.
It would be easy for the rider to never notice that what advertising is on a route is influencing route choice because they will be expecting variable routes. They will just assume the variability is due to factors like current traffic.
But what if the car was free?
We could have transport funded by advertising - think of the captive ( quite literally ) market, and the ability to have full surround advertising for the whole of the journey.
The future is bright.
Huge, huge opportunity for reaching people about your products.
OTOH cars do have very good speakers and their ears are not needed much for the road