That wing's not ablaze, it's merely iphone glare!
You're of course more than entitled to your opinion, Parabellum, but it does not reflect the views of airline professionals I work with, even if some anonymous internet posters agree with you. To reiterate:
Given:
1- a stationary aircraft;
2- 200+ souls onboard;
3- a wing engulfed in fire
The only course of action is immediate evacuation. The risk of remaining onboard in such circumstances far outweighs the risk of evacuating. That holds true regardless of any other factors and therefore to not evacuate in such circumstances is madness.