Why uncrewed air groups still need big carriers

If carrier air groups became primarily uncrewed, would large nuclear supercarriers still be necessary?

Yes. Aircraft size and mission still drive the ship's dimensions, while nuclear power improves strategic mobility; uncrewed operations may require more support personnel.

Carrier size follows the number, dimensions, and mission of its aircraft, which set hangar and flight-deck requirements whether a person is on board or not. Nuclear propulsion chiefly provides strategic mobility and sustained speed rather than magically creating a larger air group. Only a small share of a carrier's thousands of personnel actually fly, while most maintain the ship or service its aircraft. More persistent uncrewed aircraft can therefore increase maintenance and control-personnel demands rather than reducing them.