I really thing that you underestimate Hitler as a factor keeping the country in order, his ability to make speaches etc,etc.
This country was formed in ranks behind him and his thoughts of creating the third riche.
The assasination would have been done in a earlier phase, somewhere around 1935-36. maybe even erlier, to let a new leader fit into the "clothes". Who that would be, for sure not Goring and not Hess, not Himmler, maybe the Sadistic Goebbles could have filled that role.
The rebuilding of germanys military ability was not really a "nazi" doing. It had been done in secret with the help from Soviet (training pilots) Holland (bulding and training Submarines), Sweden ( constructing artillery at bofors) Switzerland (machineguns) long before Hitler came to power.
Given enough time, and by waiting 3-4 more years in starting the war, would have made Germany a real dangerous enemy to the whole world.
But, many of the achivements done by germany technicaly, was done as result of the war, dont forget this.
And to agree with Boroda, better if he never was born at all