I think it will depend on the developer community a lot. Google has been laying ground and developing a rich ecosystem of developer platforms for mobile devices and apps that are now converging into #Firebase as the one stop shop for apps development.
But the auto and wearable hasn't taken off as much as it was expected. Perhaps they're getting it right with the speaker tech and voice interface. If that's the case, then I think there'll be a landslide size of new apps and integrations coming out. They've already got the Android developer community momentum that is ready to take a leap if there is a platform that actually adds value (which the watch arguably didn't).