The whole introduction of cart witnessing is just a distraction to what they are really doing - that is herding everyone to JWTV. The whole meeting will be eventually conducted via a TV screen anyway. The carts complete with corny cart song just diverted attention for little bit.
All my own conjecture of course, but that's what I think of the carts, simply because of how useless they are. All the fanfare and drumroll for .... wait for it.......dadahhh.....carts! You gotta be kidding me!