you say this and yet they do it routinely in Australia.
if those laws pass, law enforcement will be required to investigate and I'm sure search warrants will be made mandatory for such a deal so you have no choice but to submit to being searched. regardless of how sick of it the cops may get, they will still be required to investigate and they will do it whether they like it or not.
Australia's entire legal system differs from ours, including the requirements for a search warrant, so I'm not even going to address the rest of your second-hand anecdote.
But here in the U.S., getting a judge to sign off on a search warrant when no one is even claiming that a crime has taken place
isn't going to happen without a major revision of our laws. Can laws be changed? Sure, but until it happens, I'm not going to play the "what if" game.