Power BI Charticulator Visuals and Retirement.

(certified)  visuals are contained within the javascript of the .pbiviz file, so they will not be affected.  If you want you can extract the .pbiviz from the .pbix container for versioning and/or safekeeping (if you are concerned that the visual would disappear from the marketplace).  You would have to check licensing restrictions, but you could consider making these organizational visuals in your tenant.

As they mention on the website there is hope that someone else would take over the development. 

On a philosophical level I don't understand the concept behind Charticulator well enough to judge if it has staying power. It is certainly a very different approach from Vega Lite/Deneb and ggplot. I liked that you have options, and it would be nice to keep these different options.