Was WWII....

[Foreigner]

Define 'outcome'.

For example, do you mean simply which side lost? Do you mean where the final front lines and/or the post-war borders were drawn? DO you mean the amounts of death and devastation?

But, in my opinion in general the war was not a one-shot affair. It was a prolonged slug-fest with so many people and so much resources involved, that ultimately the outcome (however we define it) should reflect the balance of some fundamental forces rather than hinging on a particular person, point in time, geographic position and even a strategic decision (no matter how important it may look). So in that sense I am inclined to think that no amount of 'what-ifs' could change the outcome materially.