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Most did, hence there was a surrender.
I'm not sure the facts support that assertion. The fact that the Allies fought all the way to Berlin and occupied it might have had something to do with it. I'm pretty sure all those Allied soldiers who were killed and injured on the way to and into Berlin might disagree.
Plenty lost the will to fight in '41.
Again, I suspect that the allied troops who took part in D-Day in June 1944 and the allied troops who were on the receiving end of the Ardennes offensive in December 1944/January 1945 might beg to differ.
Most did, hence there was a surrender. Plenty lost the will to fight in '41.