wow... that was a scary article... I once sat next to a big guy in ToT, and the bar didn´t touch my lap b/c of his big belly. Boy I hated the ride so much! I was standing up all the ride! Terrifying!!! I couldn´t make myself sit down again b/c of the speed and everything.... that was the only time that I didn´t enjoy ToT. I can only imagine what the lady must have felt not being "secured" to her seat... poor thing... it did feel terrible that time and I was inside of a whole "room" with other people, not in a car like she was... poor woman.
On the other hand, there should probably be seats for "oversized and overweighted" people just as there are cars for guests with dissabilities. There could probably be a sign requesting them to step aside and wait for their car so the CM doesn´t have to choose who to send there. (it could also work as a disclaimer...). I also feel bad for the poor CM who sat her there, he/she must feel real bad after what happened...