The prebiotic soup hypothesis describes an early Earth environment enriched with abiotically synthesized organic molecules that may have supported the emergence of the earliest biological systems. While the formation and accumulation of such molecules have been widely discussed, comparatively less attention has been given to the potential consequences of their gradual depletion. This paper explores the idea that the exhaustion of prebiotic organic resources could have introduced selective pressures on early chemotrophic systems, particularly chemoheterotrophs that depended on externally available organic compounds. Rather than presenting new experimental or observational evidence, the study offers a conceptual discussion on how resource limitation might have influenced early metabolic strategies and evolutionary transitions. By considering the prebiotic soup hypothesis from this perspective, the paper aims to contribute to ongoing discussions regarding the relationship between chemical availability and early biological evolution. No experimental or observational data were generated or analyzed, and the work is entirely theoretical in nature.