Since I was only looking at the big 52 wikis (100K+ articles), the zero results rate is under 20% (good news), but it hasn't gone down in a month (bad news).

I looked very briefly at the full text zero results rate for the rest of the wikis for yesterday. That zero results rate was 56.6%! Lots of hits from wikidata and itwiki-things! There were some DOI queries, but none of the other usual suspects.

—Trey