You're indeed correct that Moto attempted something similar with the Atrix. As a onetime Moto Webdock owner though, I'll attest to the fact that the grandparen

You're indeed correct that Moto attempted something similar with the Atrix. As a onetime Moto Webdock owner though, I'll attest to the fact that the grandparents dream is far from realized. At the time, the phone was simply too underpowered to provide a usable experience running just a browser (outdated Firefox at that). I picked the accessory up on Craigslist and it quickly found a resting place in my closet -- it was neat, but only in the proof of concept sense. I'd love to see a company attempt something similar with today's hardware. A phone like the Nexus 5 / HTC One could provide a pretty slick experience, given enough RAM.