There has to be something else going on here. I can't imagine the liability (or cost) to AT&T for the remaining grandfathered plans is really that big. (If you map unlimited data use into their total LTE spectrum use especially with the constant escalation of data allowance in new plans.)
I believe that AT&T is in a slightly different position than Verizon as far as the existence and non-throttling requirements go with the unlimited data plans (due to the spectrum purchase agreement VZ is tied too). I suspect VZ has a very good reason to get that last unlimited plan holder off unlimited but I'm not sure what motivates AT&T. (Again, IMHO, it can't be just about the costs to AT&T.)
I'll keep my VZ grandfathered plan as long as I can. Mostly because they can't mess with it. Sure they can raise the price but VZ is tied to the purchase agreement in what they can and can't due to my plan. If I switched to some other plan I don't believe that I have that same protection.
It will be very interesting to see what happens when AT&T and VZ finally get ride of their last grandfathered plan user. Only then will we really have a chance to find out what is driving these changes. (And, it might be nothing but corporate grumpiness. There is someone in the organization that just hates the fact that there are users with plans they don't totally control...)
FWIW
DLM
I believe that AT&T is in a slightly different position than Verizon as far as the existence and non-throttling requirements go with the unlimited data plans (due to the spectrum purchase agreement VZ is tied too). I suspect VZ has a very good reason to get that last unlimited plan holder off unlimited but I'm not sure what motivates AT&T. (Again, IMHO, it can't be just about the costs to AT&T.)
I'll keep my VZ grandfathered plan as long as I can. Mostly because they can't mess with it. Sure they can raise the price but VZ is tied to the purchase agreement in what they can and can't due to my plan. If I switched to some other plan I don't believe that I have that same protection.
It will be very interesting to see what happens when AT&T and VZ finally get ride of their last grandfathered plan user. Only then will we really have a chance to find out what is driving these changes. (And, it might be nothing but corporate grumpiness. There is someone in the organization that just hates the fact that there are users with plans they don't totally control...)
FWIW
DLM