If you don't know what a quadcopter is, here's a pic of one.
These things are going to allow for a much more interactive world. Imagine them equipped with 3D cameras, you can use them as your extended eyes. In this clip, there's a guy that explains how freaky it was to put on virtual reality glasses that gave a live feed from his quadcopter, and flying it directly behind him, giving him a weird out-of-body experience.
Well, in the future, this is going to become the norm. Because you can pair this with future versions of Microsoft Hololens and Oculus Rifts to insert yourself in any city, anywhere in the world. There will be a decentralised network of quadcopters available in every city. And you can choose which city you want to explore. Quadcopters will initially have limited range, but that's okay, because you can use multiple ones in multiple recharging stations around the city. Any city or remote locations that have these quadcopters along with have 4G/5G Data(or Elon's space internet!) can be explored through your very own eyes.
You'll be able to explore any city in any world through the eyes of a quadcopter. And get this... With Augmented Reality, you'll be in digitally augmented worlds. Buildings will have virtual overlays on them, trees will have their colours digitally enhanced, cars will have custom digital projections (imagine at night!) and even people will become digitally augmented. And even quadcopters!
If exploring the world through virtual reality in quadcopters becomes a popular activity around the world, you can definitely expect augmented quadcopters to become commonplace. So there may be quadcopters that will be at eye level, and just have their owners virtual copy walking around as them. You'll be able to interact and talk to them like you would in real life. You could play digitally augmented board games with anyone in the world, play augmented MMORPG's set in different cities, Or play table-top strategy games like StarCraft and League of Legends, or even swim around coral reefs in Australia's Great Barrier Reef.
I could imagine in the future, we may all just have our own gigantic water pods in our homes to immerse our bodies in, as we wear tactile scuba suites that completely immerse us in other realities and virtualities. Imagine with AI and automation, we'll have virtual companions during our adventures while our homes prepare and feed meals into us in a matrix-esque future.
Judging by how fast things are moving with Facebook's acquisition of Oculus Rift, Elon's space internet, and Microsofts Hololens. I'd predict this future should be 10 years away at most.