You're not "getting it".
The population of Santo Domingo represents about 20% of the total population of the Dominican Republic. The Santo Domingo Metro would serve less than 20% of the population of Santo Domingo.
And a resounding NO to your closing statement. Pain, inconvenience and expensiveness is the antithesis of prosperity.
Antithesis: The direct or exact opposite, such as hope is the antithesis of despair.
Ever heard the expression "nothing that's good comes easy"? Or, if you speak
Dominican, " Si quieres mognos (trensas) bonitas, tienes que aguantar jalones"? Or, "Hay que hacer sacrificios para triunfar"? All these expressions infer that "blood, sweat and tears" are an integral part of what it takes to triumph, to prosper. Certainly no "antithesis" here since effort, pain, sacrifices, inconvenience and inve$tment; combined, is the usual and most direct route to prosperity and well-being.
Although the metro will serve only SD, It will benefit everyone for the simple reason that it will facilitate the running of, and increase the number of, businesses big and small. Also, as a ramification, the smoother running of our government with obvious results for our nation as a whole.
Think of it as building a better network of roads, bridges, overpasses. Or, if you will, the many more connections between neurons that naturally develop in our brain as a result of studying and thinking hard/deeply.
The more connections, the better (faster) ability for reasoning through to a sober/sound conclusion.....No pain, no gain.