They could stop military cooperation, they could severely limit trade, they could begin to require Americans to have visas for entry.
Don’t forget this is a poll not a diplomatic statement from the Aussie gov. If it was they would have outlined what would be expected.
Though one would expect Australia to be a little more tactful when it come to foreign policy announcements or opinions on an ally’s head of state or elections for the position.
Oh, so you’re blind!