Good points.
I read the construction is privately funded as a profit-making enterprise, with the idea of charging a pedestrian toll and operating a for pay parking lot. The article states (in small part):
The project’s U.S. developer, Otay-Tijuana Venture, has agreed to build the Customs inspection facility and pay for staffing...
The new port of entry, unique on the U.S.-Mexico border, is a for-profit private venture that would be financed through toll-paying ticketed airline passengers who fly into and out of the Tijuana airport.
The U.S. development group, spearheaded by Chicago real estate mogul Sam Zell...
A spokeswoman for the group has estimated that the tolls would cost anywhere from $13 to $17 per passenger.
Their challenge is to set up a system that makes a profit without costing so much people just take the time to cross at Otay Mesa or San Ysidro.