I thought it was already 'decided' that it was preferable to make everyone BYOT and then the airline only has to worry about keeping a couple of Wi-Fi routers working instead of 200 screens. Plus there might be weight savings as I-pads get thinner and lighter.
Conversely, who'd trust Li batteries anyway...
Note: Discussions of "why" seem notably lacking. Off to get some Reynolds wrap and make a hat.