Well, I don’t know if Google thinks Apple could come up with a decent search engine or not. But to your later point, yeah. If Apple developed their own search

Well, I don’t know if Google thinks Apple could come up with a decent search engine or not. But to your later point, yeah. If Apple developed their own search engine, it would be the default on iOS. And as long as it wasn’t complete garbage, lots of people would leave it be. (And if someone did update it, would they actually pick Google these days?). Because it’s not “will Apple come up with something that makes Google Search obsolete”, it’s “will Apple come up with something that diminishes search traffic from iOS devices?