I don't think BA will be doing Hajj any time soon, although your concern (which I think it is) is appreciated. It would cost far too much to refit the aircraft with 400+ economy seats, not to mention that they'd never get the cabin crew to do it (plenty have in the past and know exactly what it entails). There's also the fact we don't go anywhere near Saudi due to the massive bullseye painted on the side of the aircraft. *
*Only visible with an Islamoscope