For one, taking small steps to make it less attractive - no more pre-selects, limited party size, and the 10 minute wait. Lots more they could (and IMO, should) do, but at least it's a start.How are they doing it now?
More intense questioning and not just going with "I have XYZ and need a DAS", plus medical professionals who can help weed out people who won't know how to answer some of the questions they're asking.
Your turn now.