Maybe I'm missing something, but how do we know that AT&T Wifi Calling will be restricted to certain plans? I haven't seen anything official from either AT&T or Apple. While I'm not going to argue with you that AT&T is forcing people into their NEXT plans, I think that any idea that NEXT will be required for Wifi Calling is, at least at this point, conjecture.
You are correct. Nothing has been announced at all from AT&T on the subject. My initial post about it was simply me saying I BET they try and do something like this when it officially launches, because they have done it in the past.