Most of the suggestions I found to make sense and be very reasonable.
The issue raised is reminiscent of how the number of people on disability dramatically rose during the financial crisis. And that's the sort of thing that's actually much worse because it's incredibly costly to society. But it's not just that one time period. As this link shows (http://apps.npr.org/unfit-for-work/) that correlation of disability with the employment rate is nothing new.
But back to the main point here - for purposes of disability parking, in nearly every case someone should be able to look to see if someone is actually disabled. Again, this is for the purposes of having that placard, nothing else. That's because the reason for having that placard is to make the distance walked shorter for those who really need it. It should be obvious to anyone looking if someone may be having a much tougher time walking than the average person. For those on disability for legitimate reasons but may not have trouble walking - guess what, they don't need the placard and can walk the extra 100 or 200 feet. What we're talking about here is something that should be visibly verifiable in the overwhelming majority of cases.