We do have anti-maskers boycotting, you'll never please everyone. Interestingly, they haven't made their own minyan.
Why would they make their own minyan? What would they oppose then (or alternatively, at that point they'll be opposing something else and will have to boycott for another reason, until they splinter into such small groups that there will be no thinking of a remote possibility of a minyan).
Here's the (NYC area communities) problem the way I see it: We had three distinct phases, the early spread, at which point some (insufficient) measures were put in place (I remember asking who is going to be the פרשנדתא after the 500 capacity limit is reached). The wildfire spreading stage (was virtually uncontrollable once it reached that) we suffered painful losses, and went into lock down. The curve turning and recovery phase - at this point we had measures that might have been appropriate in earlier stages put in place, and kept there for waaay too long, rather than trying to return to normal with reasonable measures.
I am sure that if Yeshivos, schools and shuls were permitted to open shortly after Pesach while requiring masks and maintaining some distancing and other reasonable restrictions, we would have seen much higher compliance lasting for long.