"Quinby and Snell held that the destruction of streetcar systems was integral to a larger strategy to push the United States into automobile dependency. Most transit scholars disagree, suggesting that transit system changes were brought about by other factors; economic, social, and political factors such as unrealistic capitalization, fixed fares during inflation, changes in paving and automotive technology, the Great Depression, antitrust action, the Public Utility Holding Company Act of 1935, labor unrest, market forces including declining industries' difficulty in attracting capital, rapidly increasing traffic congestion, the Good Roads Movement, urban sprawl, tax policies favoring private vehicle ownership, taxation of fixed infrastructure, franchise repair costs for co-located property, wide diffusion of driving skills, automatic transmission buses, and general enthusiasm for the automobile.[b]

The accuracy of significant elements of Snell's 1974 testimony was challenged in an article published in Transportation Quarterly in 1997 by Cliff Slater.[48]

Recent journalistic revisitings question the idea that GM had a significant impact on the decline of streetcars, suggesting rather that they were setting themselves up to take advantage of the decline as it occurred. Guy Span suggested that Snell and others fell into simplistic conspiracy theory thinking, bordering on paranoid delusions[61] stating,

    Clearly, GM waged a war on electric traction. It was indeed an all out assault, but by no means the single reason for the failure of rapid transit. Also, it is just as clear that actions and inactions by government contributed significantly to the elimination of electric traction."[62]"