N0m: On the Titanic there simply were no other available rafts or inflatable anything to utilize in the high seas. And there were no neatly formed lines waiting to enter lifeboats. Passengers simply amassed on the deck where the lifeboats were being launched. The crew also believed they had sufficient time to organize a triage of who would disembark first unto the lifeboats.
Asking to form a line, itself, is a form of triage. But that isn’t the method of triage Halacha gives. Asking to form a line of men on the right and of women on the left could be requested just as easily as asking for a single line. All the Halachic sources say to triage — and tell us how to triage. There’s no reason to be reluctant to triage when there isn’t resources for all. You can’t have a free for all where everyone tries to jump into the lifeboat simultaneously before space runs out and then fight afterwards which 30 people were the last in putting it 30 over capacity.