All true.
The Carthaginians were just a bunch of bankers, who paid mercenaries to fight all their battles for them. They were a respectable world power whislt Romulus and Remus were still suckling on their wolf-mother's teet. it took the brutal single-mindedness of the Romans and warfare, and three Punic wars, to finally topple their mediterranean trading empire; the Romans borrowed more than a few of their ideas (plumbing, economies of scale for farming, etc) before they obliterated their empire and paved their capital city and made up propaganda about their culture to try to remove them from history (He he).
Trade has never been well represented in Civ; I really liked the way Rome: Total War handled trade (where a sea port drastically improved trading ability and income).
I guess that ties in with the comments about improving sea vehicular speed and range, whilst de-emphasizing the railroads (a bit).