I love "what if" scenarios, especially those concerning dubya, dubya too.
So here's my latest "what if"... What if, Uncle Sam hadn't been shipping millions of tons of various supplies, food, raw materials, war material, etc, etc, etc, would Britain have capitulated or would someone else have stepped up to help supply her?
Personally, I think the primary language in Britain would be German now. I believe she would have capitulated sooner rather than later due to an inability to continue producing weapons.