Maybe subscriptions will start going down, but Adobe's most recent quarterly earnings report [https://wwwimages2.adobe.com/content/dam/acom/en/investor-re...] says:
>Creative revenue in the first quarter of fiscal 2018 was $1.23 billion, up from $942.2 million in the first quarter of fiscal 2017 and representing 30% year-over-year growth.
So not only are they still selling, but subscriptions increased 30% over the past year. Clearly it's working for them so much that they're finding success doing the same thing for the document cloud:
>Document Cloud revenue in the first quarter of fiscal 2018 was $231.0 million, up from $195.9 million in the first quarter of fiscal 2017 as we continue to transition Document Cloud to a subscription-based model.
Subscriptions from Adobe were meant to soften the initial sale, but Adobe's own rigidity with the subscription schemes on release shot them in the foot, as organizations had to wait a long time for a model to come out that met the needs of small/medium businesses who previously could have made due with a few perpetual licenses. The storage was pretty sad even at the time of the switch, so that wasn't a compelling sales point either.
I think Adobe just didn't pull the numbers they were expecting when they switched, and now they're stuck with this model and infrastructure they don't know what to do with.