Our best hope is kicking up a huge fuss so legislators and media will notice, so Google will be under pressure. It won't make them cancel the feature but don't forget to remember that they aren't above anti-trust law. There is a significant chance that some competition authority will step in if the issue doesn't die down. Our job is to make sure it won't be forgotten really quickly.
I also think web developers getting together like we did with SOPA/PIPA and raising awareness on our web properties can also help. How do we organize that?
Edit: Ah, here's something about it from a degoogling perspective: https://www.reddit.com/r/degoogle/comments/x1610t/what_are_y...