For consistently high volume routes I could see it being superior to SDCs. You could move a lot of people out of a place with minimal waiting. It could also be

For consistently high volume routes I could see it being superior to SDCs. You could move a lot of people out of a place with minimal waiting. It could also be part of a network, with transfers to and from SDCs, which could be arranged to be waiting per passenger at the terminal. Say you have a major sporting event letting out. These could run from the stadium to smaller collection points for SDCs. Less congestion, less miles traveled for SDCs. Faster, too. These could be the city-wide movement system, and SDCs the 'last mile', so to speak. It's possible they're more efficient in maintenance and energy per passenger mile, as well.