Pascal said had Cleopatra's nose been shorter, "the whole face of the world would have been changed." Was Edward VIII's lover Mrs Simpson equally important?

Having mentioned Andrew Lownie's biography of King Edward VIII, the question arises: would Lord Halifax, not Churchill, have succeeded Chamberlain as Prime Minister had Edward VIII still been King in 1940? 

If so, we would have explored the peace terms Hitler was offering.

Would England have made peace with Germany? 

Would this have been good or bad? 

Would it have deterred Japan from attacking Pear Harbor and the British Empire? 

My guess is yes.

Would Bolshevik Russia have defeated Germany without allies? 

My guess is also probably yes, but nobody knows.