When I visit the SilverBullet link, I get a wall of text. And at the very top is a warning about versions and a link to migrating your data between versions, which leads to another extensive wall of text with various code and configuration examples.
Many people, even busy tech savvy people, are going to shy away from this.
To be honest, it looks kind of interesting to my inner nerd, but I think I'll stick with my "directory of plaintext Markdown files" that I've moved between apps as they've come and gone.