Yeah BB has previously said that the Slim browser will be the alternative solution after 2020 but that no longer seems like a possibility after the recent Adobe posts. For any other kind of working solution they have said they are looking into them but that has been now said for over 3-5 years without any kind of hopeful information being ever shared. Less than 6 months left and by now they could have had at least share a blog post of possible alternatives they are actually looking into like many other companies did after the original Adobe announcement 2-3 years ago.
It just seems that they know they have hit the end of the road but cannot admit it in public because it would cut all further gem sales down to zero and kill further new player acquisition.
Here is one of the recent Adobe pages
https://www.adobe.com/products/flash...d-of-life.html
BB has officially said no to the 2. point several times.