A better example. Some rookie cop pulls over a guy for a minor traffic violation. Based on a number of minor clues, he (incorrectly) thinks he's got probable cause to search the vehicle for drugs... but he's not quite sure whether it'd hold up in court.
Instead of just going with his gut and conducting what would ultimately be considered an unconstitutional search, the cop lets his partner bring the drug dog over while he's writing out the ticket. The dog smells nothing noteworthy and the rookie lets the guy go without a search.
I'm not agreeing that the number of unreasonable searches would actually decline by any significant amount... but it's possible.
That is a better example, but its still a "search". The officer basically just performed a preliminary search to determine if a further search would be necessary.
Also I'd like to add that by definition the number of unreasonable searches will decline due to this ruling because the standards of what is a "reasonable search" have been greatly lowered.
Its akin to solving the illegal immigrant problem by just giving everyone amnesty and reclassifying them as legal - the number of illegals would go way down.