Hi Stewart, all the things you bring up are real and accurate, but the government call the shots with no consideration for the general users. Sooo, yes and no on equipping all the planes with ADS_B. Most yes and the Turbine with the 1090 because we use it in the Canadian Arctic. It is expected that the Canadians will go to that as of 2021, it also has a form of Tcas. My 185 and Husky in Alaska will get UAvionex (I'm a dealer) because headed into ANC and the weather craps out you will either need ADS-B or several pens to write why you did everything on that flight wrong and needed to shoot a approach.IMHO ADS-B installed has nothing to do with safety , it's all about doing what you have to for legality. To be honest going into Lake Hood , if everybody had ADS-B by the time you figured out you had a problem ,by looking at a screen, then looked out and finding your target , then taking evasive action or just keeping your head out when Vfr , up to the user.
Now when your out in bad VIS. Blasting thru Rainey Pass and its living up to its name ADS-B would be great if everybody had it working. But like you said that isn't going to happen so let's just keep announcing on common freq. like we do and head out looking. Sorry for my option but it is what it is.