Canada and Australia already had the fleet foundations

What infrastructure would Canada or Australia need to sustain a strong middle-power navy into the modern era?

They already possessed much of it after 1945; governments chose not to keep funding the carriers, cruisers, submarines, auxiliaries, and bases at the same level.

Neither middle power lacked the infrastructure for a durable naval tradition after 1945. Sydney and Fremantle or Perth supported Australia, while Halifax and Esquimalt anchored Canada. The harder problem was maintaining political commitment to the fleets already built.