Haven't said a word til now, but my first--and persisting--reaction, is the plane should have been evacuated immediately.
These feelings were reinforced by the fact that the pilots, apparently flying on one engine ("FL170"), did not during their two-hour deturn to Changi, land as they may have been required to do, at any of the other suitable airports along the route. To me, this suggested that their wish to save face or please their superiors must have overcome any impulse to divert.
In any case, as a passenger, I couldn't have sat their complacently taking snapshots of the wing burning, anchored to my seat by the faith that the wind would continue blowing in the right direction and all the big guys have everything under control.