In the future, you will be able to build custom robots just like LEGO. HEBI Robotics is already working on such a solution. It has smart, connected building blocks for custom robotic solutions for every scenario. You get modules with a brushless motor, geartrain, encoders, and control electronics that communicate using 10/100Mbps Ethernet.
Such a solution allows you to customize your robots for specific tasks and get the job done in less time. These videos show what you can do with X-Series robotic modules.