There is no way either T-Mobile or Sprint will make substantial gains against the big two. Yeah, T-Mobile may gain back some of the customers it lost the last 2-3 years, but is unsustainable. T-Mobile lost money (granted not much) last quarter. The iPhone does not come cheap. So in a stalemated mature market what do you do? Yeah everybody will make some money, but where is the growth going to come from.
I am fully for the merger. I also would be fully for putting some buildout requirements for at least the semirural areas, as in, the resulting entities have to cover all highways and towns over a certain population.