What does bartlett claim hitler would have done if chamberlain had "stood firm" and not pursued appeasement?

The critic Barlett believes that Hitler can be down if Chamberlain had stood for England and did not appeased. Some say that Chamberlain did this as a tactic to have a longer time to prepare the military for war. Barlett explained that Hitler does not have the support of his people, because of the war memories they have with them.