Weight repartition and balance is extremely important in an aircraft. If everyone moved to one end of the aircraft it could cause loss of control and crash
Why break the cockpit doors when you can just get a bunch of terrorists strategically running around the plane to manipulate it just at the right angle of attack to steer it towards a building?
How about just bunk beds with seat belts or some kind of restraint and a paddled ceiling inside your bed space.
The next dumb thing to having an completely open floor space is in installing seats and normalizing the idea that people should sit in them for 8, 10, 12, 14 hours periods.
The only time we need seats with restraints is in the ten minutes after take off and the ten minutes when landing .... the rest of the time, I would prefer if I just slept the entire time.
I'd give up TV, a monitor, music, a window, free food and drinks if airlines just gave me a bare bones option of just being allowed to sleep flat for the entire flight.
I unironically think this is how plane travel should be. Slide me into a tube and gas me asleep. No peanuts, no crick neck, no risk of hijacking, and no praying and screaming when we slam into a mountain at 900km/h because the pilots had a bad day.
There are several ways they could do stacked beds or offset-stacked reclined seats that would not only be more comfortable and provide more room for the passengers, but also allow them to cram more people in the plane.
I know this is a shitpost, but in case anyone is curious this link has a video of what can happen if a plane has unsecured weight onboard that is allowed to move around.
On 29 April 2013, the Boeing 747-400 operating the flight crashed within the perimeter of the Bagram airfield moments after taking off, killing all seven people on board.
The subsequent investigation concluded that improperly secured cargo broke free during the take-off and rolled to the back of the cargo hold, crashing through the rear pressure bulkhead and disabling the rear flight control systems. This rendered the aircraft stuck in an uncontrollable pitch-up attitude and induced a stall, and made recovery by the pilots impossible.
So it's not just unsecured cargo, but unsecured cargo that disabled rear flight control systems. I'm guessing unsecured people wouldn't cause the same problem, but it could certainly cause other problems.
I think this is actually a demo setup by boeing - there are track systems that the seat rows anchor into on actual aircraft, and those tracks are flush with the carpet.