The thing about Washington is that the cult of personality around him was one of the relatively few ties that bound the young United States together. Arguably it's one of the most effective in history, and it galvanizes a nation and creates the whole institution of the presidency. Without Washington, I think you don't have the presidency as we understand it, and I think the strains might have broken the country apart earlier and more permanently than the OTL Civil War.
Or the US might have to carry on far longer under the AoC.
Several of the ratifications - including the crucial one of Virginia - were by narrow margins. Without the support of Washington, and the foreknowledge that he will be the first President, does the Constitution ever get adopted at all?