I think the next 10 years will spawn a new development of components based around 3D printing, eg. instead of us using pre-existing components. Stepper motors, 8mm shafts, stock bearings etc... for example, we use the same ones as they have been using or decades in photocopiers and other devices. There can't be too many more designs for 3D printers left, there is literally so many ways to make a machine do the same thing in different ways, so realistically the next step has to be actually improving and creating new smaller, lighter and custom components for 3D printers, like higher torque smaller steppers that require less power.. heatbeds that don't draw 5-8 amps... better hot ends, jam free feeders etc..

I am hoping in 10 years we have the neat bubblejet cheap devices on our desk.