I agree that a ubiquitous and continuously running subway would be better than jitneys for most purposes. But we don't have that kind of time.

We will have to build the subway (or other light rail) at the same time as we are deploying jitneys and banning non-commercial vehicles from the city centers. Eventually most of the jitneys move out to the area beyond the light rail lines... assuming we ever get those lines built.

Transportation fuel has become a major near-term crisis for the whole world. The longer we wait, the worse things are going to get. At this point we no longer have the luxury of letting some envisioned optimal solution prevent the quick implementation of some kind of working system.

We no longer have a choice.