Societal collapse is unlikely. In spite of personal differences that people have, they tend to maintain civil relations with each other, even through times of major economic and social instability. Sometimes international wars may erupt and many people die. But based on amount of casualties from previous wars, its likely not enough deaths will happen to put humanity in extreme danger of extinction. Only when a certain mode of conflict poses the real threat of human extinction (like nuclear warfare), its more likely that people will collectively do whatever they can to avoid these modes of conflict, because of the irreversible damage it would cause to all humanity if this mode of conflict were to become reality.
A natural disaster (e.g. total wipeout of essential resource for human survival, or meteorite strikes planet at 1 million mph), or deliberate population control (e.g. mass sterilization / genocide of people from a specific demographic), would be more likely imho