That's what I was thinking. If the sites get heavy iOS usage, the referrer data is showing Google searches again. But if they're logged in, it'll still show (not provided)
FWIW I'm about 85% sure that eventually all organic keyword data will suppressed. Some of my sites are over 65% not provided now; even my consumer oriented and event sites are creeping towards 50%. The writing is on the wall there for me.