They have a low market share now, but there's really not much of a barrier to switching. So if Chrome does still go through with implementing this, people can hop right on over to Firefox.
The barrier isn't just on the user side. The initial phase of government sites – i.e. web sites where the vast majority of the public are required to use to do official things — were designed with Internet Explorer in mind exclusively. Now many gov sites officially support Chrome as the default, and sometimes mobile Safari. Right now Firefox is at 2.7% [0] of us.gov visitors, almost half that of Microsoft Edge.
The average user, especially those in business/professional settings, are going to keep Chrome as their default for a long time, even if FF becomes equivalent or even superior.
The average user, especially those in business/professional settings, are going to keep Chrome as their default for a long time, even if FF becomes equivalent or even superior.
[0] https://analytics.usa.gov/