Pretty much the only people that you are going to scare are the people who haven't yet switched. I'm not scared because I have quite a few months experience with Firefox and several years with IE6. I have my own experience to judge your statements by.
Personally, I could care less if everybody but me uses IE6. But you certainly won't see me using it again.
Love Firefox, but I have noticed that certain web pages do not fully load graphics, and flash demos don't work.
Tried to get a straight answer from Mozilla i.e. in terms a lay person could understand, but got no satisfaction.
Any ideas? And, yes, I've uninstalled and reinstalled the latest version of flash.