As seen in newer airport designs terminal designs are implementing new passenger bridges to route from “head-houses” to the individual terminals. Additionally as in Atlanta airport there is an underground train/trolley system to traverse the terminals from the head-house also. I know Orlando International also has an elevated trolley to do the same.
Bridges would require structures to be able to be built without support underneath, so might require special terminal material/object to be added. Also height would need consideration for aircraft to be able to pass underneath. (See LaGuardia Terminal B Design for reference).
Would love to see these feature implemented.