Could the Washington treaty disappear?

Would the scenario create permanent Dominion flagships or another lasting Dominion naval arrangement?

Possibly, but the larger effect may be no Washington treaty if the United States chooses rapid capital-ship replacement instead.

A lasting Dominion flagship arrangement remains possible in the scenario. A potentially greater effect would come from completing the Admirals as fast battleships. An American fleet considered outdated beside them could create a strong demand for capital-ship replacement. In that branch, American eagerness to rebuild could prevent a Washington treaty.