I'm opposed because I believe that AT&T doesn't need T-Mobile's spectral licenses, much less their relatively small network, in order to properly invest in and continuously improve their own wireless network (something Verizon Wireless, BTW, seems to have consistently excelled at for its entire history).
If there is a need for spectrum, T-Mobile isn't the only other company that has it (nor are Sprint and Verizon). I'm sure arrangements can be made for more spectrum, and coverage can be infilled with more towers/antennas for more capacity.
I believe that the AT&T commercial touting the merger as catalyst to bringing mobile broadband to whatever percentage of the US population, "including many rural areas and small towns" is complete and total BS. I think they outbid other suitors primarily to eliminate a competitor.
The proposed merger will be a bad deal for all consumers.
An aside:
Does anybody remember the olden days (the pre-digital era), when you had the choice between cellular carrier "A," and cellular carrier "B," and cell phone bills were large.
We're slowly but surely trending back in that direction, and our bills are on the rise again.
In my area, one of the two carriers choices became part of Verizon Wireless in 2001, and the other one? Yep, you guessed it: AT&T Wireless.
I just thought the irony was amusing.