Chrome have been the IE6 situation all over again for a while now, except this time it's possibly too late to walk back. They are pretty much done taking over the standard.
To be fair, the IE6 problem wasn’t just massive usage, it was massive usage plus complete stagnation.
Chrome has high but not massive usage, and it hasn’t stagnated. It has a separate problem though: the lack of stagnation is actually a drive towards Google’s somewhat unhealthy vision for the web.