Hi Chris,
I cannot speak to the future of DNN but I know the community is strong and you can see updates done in the last few days - https://github.com/dnnsoftware/Dnn.Platform.
You can also see the conference happening on February: https://www.dnnsummit.org/
As far as I know, DNN is strong and healthy.
The DNNStore is a different story. The store is controlled by DNN Corp, which I haven't heard about in a few years.
Cheers,
Aderson