I'm glad you find it useful. 1. Helm is not going to stop working anytime soon. I haven't even upgraded Helm in my configuration for a long time, and the ver

I'm glad you find it useful. 1. Helm is not going to stop working anytime soon. I haven't even upgraded Helm in my configuration for a long time, and the version I have installed still works fine. 2. The latest version of Helm should continue working for even longer. 3. It shouldn't require much effort to make the occasional fix to Helm for compatibility with newer Emacs versions. 4. It's likely that Helm will continue to be maintained by someone, if not Thierry after some time away. 5. org-rifle already has a non-Helm interface built-in. 6. See also org-ql, which supersedes org-rifle to some extent.