just want to chime in on this whole discussion. i've posted this in other places but wanted to share it here as well.
while the new simcity seems to have less transportation network choices, what's more important to me is that what actually is in the game will be COMPLETELY FUNCTIONAL. without nam, simcity 4's traffic generator was a mess and once your city reached a certain population, it was a total disaster. even with the nam, traffic eventually can become overwhelming without properly planning ahead. sure, the real highway mod makes for some beautiful highways and junctions but most of the time they don't function in the way they should and are rendered completely useless, serving no real function other than pure eyecandy. additionally, a huge problem with simcity 4 is that sims would always take the shortest physical route rather than the most effective route. the new game fixes this by having them take the fastest route instead. then there's the fact that the automata isn't persistent so you'd have cars appearing and disappearing at random. in the new game, every vehicle on the road, every bus, every train, etc, is a real object simulated in the game and you can watch it depart and arrive at its destination.
yes, it's a shame that we're not getting certain transportation options, but i rather have the developers focus on creating a limited amount of real and fully functional networks instead of just cramming the game with as much stuff as possible.