>Having self-driving cars from Google integrated into the same ecosystem could have serious repercussions for users, so is this wise? Do we need legal changes, or should Google just change their model for locking out users?

Break them up, and force the patents to be openly available for a nominal fee (like the patent on the transistor once was). Refuse to license a self-driving car for street use if a centralized firm, rather than the car's owner, can decide how it's used.