I'm surprised nobody's yet mentioned....
A bigger funfair with a very large Ferris wheel ( which will promptly be invaded by the 'stepladder brigade' to get their 'unique' photos )
More car displays-preferably something noisier than the Caterhams, though.....or even better, a speedway track!
A BFO stage/arena just inside the Blue entrance, where they can have different groups & solo artists performing each day.
More blue bollards.....I can't be the only one who felt there was a dearth of them this year.
More GA stuff....you can't have enough Cessnas, Gulfstreams, Beechcraft, Pipers, Grobs & Robins, not to mention microlights/ultralights.
Oh, and balloons.....lots of balloons