No, not just No... Oh HELL NO.
Unlike some I've actually studied the history of the second world war, Hitler did more to lose Germany the war then most of the allied nations. Even if the assassination attempts on his life in '44 had worked it would of made the war worse, the cable trying to knock him off wanted to organise a negotiated end to the war... guess what that would have meant? The Allies would have taken it, which means the holocaust would have been covered up.
The German's have a word, Zeitgeist, it means "the spirit of the age", which means that the world was going to have a second world war no matter what, the times were right for it, but take Hitler out of the picture and suddenly so many things could go wrong, Germany might not have invaded Russia, it might not have shoved its balls into the grinder by following the Japanese in declaring war on the US (yeah, the US declared war on Japan, Germany declared war on the US, there is some debate if the US would have entered the EU war without Germany doing that).
Frankly there is so much that could have been so much worse, so, let history be history, and don't screw with it.