I suggested this at IBM Research around 1999, and built a proof-of-concept speech-controlled 3X3 display wall of old ThinkPads otherwise destined for "the crusher". Wow, was my supervisor surprised (to put it mildly) when he got back from a two week vacation, as I had built it when he was away so he could not say "no". :-) Another contractor in the lab described his reactions to me though, and helped calm him down. :-)
A couple regular employees associated with the lab had helped me get the equipment. Every laptop had to be officially tracked with an owner and even locked down to comply with IBM policy, even though they had been discarded/scrubbed and were heading for destruction. Ignoring time costs, the laptop locks were the most expensive part of the project in a sense given pretty much everything else was recycled, and a regular employee coworker got them for me out of his own budget (thanks, David!). Another regular employee helped with the networking aspects and tracking (thanks, Mel!).
The people are IBM who dealt with old equipment were very interested in the idea. Who wants to see useable equipment get scrapped? And there was so much older equipment from such a big company, plus from leases and such. But I guess, within Research itself, the project then was not that exciting to people focused on "new" things.
I even wrote up a mock commercial for such display walls with a female executive mother working from home in front of a huge display wall, and her little daughter came by to say hello, and the mom had programmed something fun to show up on the wall for her daughter.
Before we got treadmill workstations, my wife also liked the idea as a way to keep fit -- that you would be walking around all day in front of this display wall you were talking to, rather than sitting in one place and typing.
ThinkPads were interesting in that they could fold flat, so you could layer them on top of each other. However, I also suggested back then that ThinkPads could eventually be designed for reuse in this specific way.
But as just a contractor, and about then hitting the 1.5 year limit for contractors at IBM Research (a rule to prevent them being ruled as employees), the idea sort of fizzled. There was some preliminary negotiations about hiring me as a regular employee, but I probably asked for too much as I had mixed feelings then about the all embracing IP agreements that IBM had and similar things (although I really liked the speech group -- great people), and I also had hopes to even then get back to educational and design software my wife and I had been writing. I did go back a couple more times at IBM as a contractor, but it was for other groups unrelated to speech. Anyway, so that idea faded away.
The display wall looked a bit like part of a Jeopardy set, and you would tell it what specific screens you wanted to do what with. Another speech researcher asked me to set it up in a new lab when I was leaving. So I can wonder if, indirectly, the idea floating around sparked something at IBM Research eventually related to Watson and Jeopardy? :-)
My major use case for the wall was to use as a design tool to make complex engineering projects, like a self-replicating space habitat. However, I also tried to get the IBM Legal department interested in using such a speech-activated display wall for reviewing legal documents and tracking cases, with using such systems backed by a supercomputer becoming a perk for IBM lawyers, but also did not get far with that.
I'm now past the expiration of my non-disclosure agreement on such things that I did or learned at IBM Research back then, thankfully! :-)
Anyway, one could probably do much the same with discarded cell phones...