If there are multiple people in the line going to Orient they MIGHT take more than one couple. IF they do, they should reflect it in the fare/price. There is a dispatcher at the airport and they will not allow a van to sit for very long without either loading people or moving them out. Not all taxis are vans either so if just 2 of you it could be a car.

To specifically answer your question, I do not think all vans will sit until fully loaded.