> Tell your management that usage of v6.0 is as good as gone, and you are wasting resources in doing any work to keep support for it

How do you say this without any knowledge whatsoever about the type of app they work on, or their target audience? v6.0 alone is almost 2% of users based on that chart. In fact if you include everything before v8.1, you seem to get something like 8% of users. What if their app, say, provides the poorest people access to public transportation? Would you really just drop 8% of people on the floor in any scenario?