Considering how dependent on federal funds local police depts have become, we're most of the way there. If a fed tells a local police chief "jump or lose federal funding", the chief will just ask "how high?".
I firmly believe that DHS is going to start funding the equipment expenditures of police departments and the first item on the list will be to pay for every police agencies sidearm, which will be .40 caliber of course.
This will jibe with the 450 million rounds of .40 they just bought, as in HP, not ball.