The passenger car park does look empty however a comment on another forum believes that off-site parking companies seem busier.
Cardiff Airport figures have fallen as capacity and flights have reduced. The passengers now seem to use Bristol & Birmingham airlines to travel.
Easyjet flights may work on a 'W' pattern for some of the busier such as Malaga, Alicante, Murcia etc however it is not likely this would happen any time soon.
On delivery of the A330 a 1 x weekly Cardiff - Orlando should work as a summer only flights. Also a return to Cardiff - Cancun.