I flew back from Nice on Sunday on eJ as pax and there was no hand luggage allowed on the flight. Also confiscation of bottled water etc purchased in duty free itself.
Only things allowed on board were passport, wallet and a book / magazine.
These security arrangements appear to be in place simply to scare passengers away judging by the fact that people were actually in tears from fear as they believe that the reason for the additional security at Nice alone is that there is an actual threat rather than assumed.
Not sure how many people decide not to fly in the end but I know my wife needed convincing onto the flight and was very close to not getting on and getting the train back instead!