Losing Chrome doesn't necessarily stop you being tracked. If you make a vacuum it will be filled by someone else. I am not suggesting apathy but opting out just makes holes for someone else to fill. And as we have seen in the past competition is great but it quickly gets amalgamated behind the scenes, just look at the alcohol industry. All those brands look like healthy competition, but it's largely one parent company.
You can imagine that a young Instagram or What's App could have been on the safe list of alternate social platforms, but Facebook bought them both. Firefox isn't impervious to a change of management and ownership 5-10 years down the line.
So what you are left with is using esoteric applications and social spaces that no one really cares about. That's analogous to living off the grid. It just isn't really suitable to the majority of people and as such it isn't a solution at all.
The problem isn't Chrome or Google per se, it's technology. We should be pressuring the big guns to conform to our needs, not opting out and abandoning the people who benefit from large social platforms and convenient, well supported applications.