Tarpit ideas are concepts or technologies that seem promising but often lead to stagnation or failure until the right conditions or advancements make them viable. The discussion highlights how many successful technologies, like YouTube and electric cars, were initially tarpit ideas until advancements such as DSL internet or battery technology facilitated their success. The importance of recognizing changing contexts for ideas is emphasized, with real-world examples illustrating that timing, technology, and societal shifts can turn previously failed concepts into successes. The comments underline that observing these shifts can provide insights into potential future successes.