I have a Skybell on my home, and several of my customers have them as well. Recently a customer wanted to upgrade to the Skybell HD so I checked ADI and found nothing in inventory at my local branch. I checked their nationwide stock and see 1 is available. Hoping to get one right away, I went to my local Best Buy, where I bought them before and found no Skybell products and a clerk told me they do not carry the Skybell wifi doorbell.
Honeywell's Total Connect is compatible with Skybell, so it seems Honeywell decided to partner with Skybell for a wifi doorbell feature. I believe Alarm.com partner's with Ring.
I searched the web for any recent news about Skybell, and found nothing about what might be happening.