I doubt they collapse, this is a war of attrition started by the Saudis and Russia. They are attempting to force all of their competition (primarily each other) out of business by continuing to flood the market with oil. They are betting that they can outlast the other. These are both nations that care very little for their citizenry outside of the elites so both are willing to go to lengths other democratic nations would not.

Either side could likely stop this with the consequence only being loss of face.