No, I'm not a pilot - but I don't believe that waiting around patiently in a crashed plane waiting for it to catch fire is a prudent idea.
Granted - perhaps there needs to be some sort of command half way between "we'll wait here for them to bring the stairs" and "get out now, the plane is on fire" - in short, a command for a controlled, orderly exit.
Had the plane caught fire even just a minute or two faster, I suspect I wouldn't be the only one asking why the pilot didn't order an evacuation immediately.