“by the beginning of the war most Germany’s Jews had been expelled or left. It is only around 1942 (when Hitlers sees that the war might be lost and in his paranoia blames the Jews) at the Swansee conference in Berlin that the final solution begins. It is then that Jews start being transferred to the concentration camps from the Ghettos they were originally being held in.”
On the contrarry, Jews were being sent en mass to the concentration camps from late 1938 following the policy of ‘extermination through labour’ whereby they were worked to death rather than being killed directly.
The direct extermination began towards the end on 1939 when gas vans were first used, there was also mass extermination through shooting as the Nazis invaded the Soviet Union.
The Wannsee Conference resulted in the creation of the death camps themselves, mainly as a result of Heydrich’s complaints about the inefficiency of other methods and his impatience with the progress of the Final Solution.
Also, I don’t think Hitler had realised that the war was lost by the winter of '41-42, although Operation Barbarossa had ground to a halt, it hadn’t yet become clear that the USSR was able to make a successful counter-offensive.