ive never seen it in person, but i did see it recently on a history channel show about bathroom technology. i think it was in the line of sloan touch free devices. but to tell the truth, i don't really think that this is needs to be done, it is the only fixture in the bathroom which people don't really touch, they only touch the end of the roll, which nobody has touched before. also, im not sure how your design make sure the end comes out, since it seems to frequently be stuck to the roll by static.

As much as I don't like it, I believe you idea would sell.

I've worked where we had a motorized paper towel dispenser and a motorized foam liquid soap dispenser, but they both ran off of batteries, so we had to have a regular push-down soap dispenser and a folded paper towel dispenser too.

I really could see no value in either of these. Like drewnahant said, you really don't touch the TP or the paper towel and when you touch the soap, you're washing anyway.

As for the TP dispenser, you'll need to be sure to design it so when vandalism minded teens urinate all over it, it still works. Yuck.

And wasting electricity and fossil fuels to run these is silly. I guess I'm a curmudgeon, but I still think I can flush the toilet myself too.

I think this idea of mine is in the chindogu category of invention. But it probably would still sell if it worked, the market audience may be luxury buildings or people who like gadgets. And at the right price, and sales pitch, anything can sell. And lots of things sell that have no value, such as novelty ornamental trailer hitches.