I agree, that build size does limit at home 3D Printers. Imagine being able to print entire TV stands, Desks, Lamps, Chairs, etc. That's when people will step aside and say, "this technology is for me". Unfortunately printers that you put in your home would, like you said, take up entire rooms. This isn't feasible. The other option is to print the larger objects in smaller parts, and then put them together. It would be nice if there was some way to print large items on smaller printers, but honestly I can't see how it would ever be done.