Why did logical positivism decline as a distinct philosophical movement?

Logical positivism declined as a distinct philosophical movement primarily due to internal challenges in defining its core doctrine, the verifiability principle.1

The movement’s central goal was to establish a strict criterion of meaningfulness to distinguish scientific knowledge from what they deemed the "meaningless" utterances of traditional metaphysics. However, proponents struggled to formulate this criterion using mathematical logic. Proposed definitions were often either too broad—accidentally validating metaphysical claims—or too restrictive, inadvertently excluding essential scientific hypotheses.21

Furthermore, the verifiability principle faced a self-referential critique: because the principle itself was not an empirical proposition, it appeared to be either meaningless or merely a tautological definition by its own standards.3

As these difficulties mounted, the movement evolved into the more moderate "logical empiricism," which focused on understanding scientific method rather than strictly policing meaningfulness. By the 1950s, interest in the original, rigid framework of logical positivism waned, and by 1970, it had ceased to exist as a distinct movement.142