Yup. That's my worry - I can block them now, but what do I do when all these devices have their own "WhisperNet"?
I think most of us aren't worth it, as it would take away from the upfront profit of the machine to add features people aren't told about just to get a few years of "Subject opened left door. Temp 39 degrees. Subject used ice maker." or whatever.
I even saw the newer broadcast TV standard was going to have 2 way communication for ad tech.