My hope is that someday we'll see a resurgence of development for it, or the creation of something new like it. A lot of open source projects have survived on a very slow burn for a very long time, only to show up again later.
What's truly unfortunate, is Sandstorm was massively ahead of it's time: A lot more people are willing to understand the need for Sandstorm today than they were just a few years ago, when Sandstorm was an active development project. I feel like if Sandstorm had launched in 2019, it'd have enjoyed a lot wider support than people were ready for in 2014.
There will be a continual need to "hold your own corner" of the internet (self-hosting common services) as it becomes even more segmented by Google, Facebook, and advertising companies like them.
https://news.ycombinator.com/item?id=20933849