Honestly, I do have to agree with the position taken against AT&T here. Competition is important, especially in the telecom market, which has no become the cell phone market. Those who have any semblance of a memory for history would know that things weren't exactly peachy the first time AT&T had a monopoly in America, and giving them a second round isn't any better an idea.
[citation][nom]blackened144[/nom]No one has answered this question yet.[/citation]
Here's your answer: you're making the fallacious assumption that if T-Mobile dies, all its assets will just vanish into thin air.
Rather, what will happen is that it'll give a chance for smaller start-ups to snap up its assets (especially towers & spectrum, but also potentially subscriber contracts) and hence still giving the USA a fourth major cell provider.
On the flip side, if we allow the merger, we wind up with AT&T going from merely having a plurality, to being just shy of a majority of the market, with only a total of three major carriers. This results in us being closer to having a "too big to fail" situation; with more significant companies, the higher the likelihood that people will be able to allow failing companies to go their natural course. If that's the course in store for T-Mobile USA, then so be it.