Why Chamberlain could not remain a wartime prime minister

What changes if Neville Chamberlain remains prime minister during the war?

He might last somewhat longer, but he lacks Churchill's combined international, public, and parliamentary support and remains vulnerable to blame for rearmament and prewar policy.

Neville Chamberlain could remain prime minister a little longer, but he lacks the broad wartime support needed to hold the office. His strengths fit peacetime government, while Churchill commands greater standing abroad, among the public, and across Parliament. Chamberlain also becomes the political target for the pace of rearmament and prewar decisions made while he led the government. Some of that blame belongs elsewhere, including Churchill's earlier construction pause, but responsibility still attaches to the prime minister in office.