Some of us from back in the day are still around. Admittedly it was long ago I last posted here, but I still keep a few PHP-Fusion sites up to date. Actually updated one of them today to 9.10.30.
Interest dwindle as people look at other technologies to represent them on the web but I see how more and more is done via a command prompt and frankly I hate it. Of all my sites that were PHP-Fusion only one has been migrated to another platform, some others are under new owners and, as mentioned, I retain three.
I find PHP-Fusion very hard to replace and can still think of numerous improvements that could be done, some of course inspired by other platforms and some olde ones that never made it through development, mostly due to lack of resources and manpower.
Sadly I never picked up on coding as much as I would need today and depend a lot on others to implement my ideas, if not possible in a drag-and-drop scenario or low-code solutions.
We seem to be in a low spot right now, many of the original authors gone and just a couple holding our flag. I have no solution for this, it is the usual evolution of software, if no new talents find they want to spend their time here, we will keep having problems with continuing work on this platform of ours.