He was kind of in a unique position being the first person really in charge of British North America. Would he be the type to recommend the changes needed to avert the ARW?
Would it really effect the American theater of French and Indian War?
... Virginia had essentially hijacked the empire's strategic aims to protect her Ohio valley land claims.
Remove the strategic incubus of Duquesne and the UK/Colonies can concentrate much sooner on the actually important regions of upstate/western New York and the Maritimes. That might shorten the war in North America.
If both Braddock and Washington survive I think it would lessen Washington's acclaim after the fiasco. He rode back and forth after the battle holding the forces of the British and colonials together.
Having less fame at the beginning of the Revolution may lead to some one else being picked as the American commander. Gates perhaps? Warren? or Lee?
Perhaps Braddock is court-martialed? By dying he avoided such measures. By surviving he could be worse off. Getting into a messy situation could be known in America nowadays as "Pulling a Braddock".
Braddock could not have survived. Kenway would keep trying to kill him as Desmond White attempted full synchronization with the Animus.
... I suspect he would have been a disaster if he had lived.
As opposed to the other British leaders & their policies for the colonies?