That's what I was hoping for. I hadn't heard them for a long long time and today I saw ENC on the screen. They've been encrypted full-time all day today. I'm not sure how encryption is really necessary for fire operations, especially if it's full-time. I'm guessing if they needed interop with DMFD, they'd have to go analog anyways.
I never heard anything interesting happen on Airport Fire, so I'm not really mourning a loss here, but I'm sure someone else out there has found it to be enjoyable.