Re: The market has moved beyond basic handheld consoles, ...
I'm just thinking of the stationary bicycles with dynamos connected to a 60W bulb that used to be at festivals... as a young teen I struggled to get the bulb very bright.
With the usual caveats about dynamo efficiency etc, my intuition is that a cyclist would struggle to power an older Xbox (they ran hot), but might have a chance with a handheld console (with battery just used to even out the dynamo's output)