I’m not going to rehash again how we already test all registered packages for all Julia releases, and how community voting for packages is of little consequence on whether or not any particular work happens.
But it might be interesting to make something like this part of the annual Julia User & Developer Survey (organized by @ahclaster, I think). Along the lines of “which packages do you think are particularly central to the Julia ecosystem”. Nominations would happen during the feedback period and then everyone could vote in the actual survey. It would certainly be interesting data to have, and could inform some decisions on which packages to test with more scrutiny.