I would have been really hard pressed to stay in my seat as a passenger and not open a door and pop a slide myself after seeing the wing on fire.
The Ci incident in Okinawa with a 738 was fully on fire and exploded in the less then 6 mins it took fire trucks to arrive. Do you remember the flight crew jumping from the windows just one micro second before a major explosion? These people on this triple 7 were super lucky. I don't think had the flames gone on much longer it would have been the right decision not to evac. Amazing the whole wing did not explode.
Singapore is such a rigid society with rules up the ying yang. I would guess the flight crew were Singaporean? I think an American flight crew would have shouted eVAC EVAC after seeing that whole wing on fire.
9 year old 9V SWB is most likely a write off. The plane had been regularly busy in the days prior. So it didn't just come out of maintenance like the Ci 738.
https://www.flightradar24.com/data/aircraft/9v-swb
Wonder if the fuel soaked wing caught fire from the heat of the engine (and/or brakes on landing) after the air speed reduced and fuel was getting in contact with the hot section. Or reverse thrust put the fuel onto the hot engine?